Front Matter

ADVERTISEMENT. The Committee appointed by the Royal Society to direct the publication of the Philosophical Transactions, take this opportunity to acquaint the Public, that it fully appears, as well from the Council-books and Journals of the Society, as from repeated declarations which have been made in several former Transactions, that the printing of them was always, from time to time, the single act of the respective Secretaries till the Forty-seventh Volume; the Society, as a Body, never interesting themselves any further in their publication, than by occasionally recommending the revival of them to some of their Secretaries, when, from the particular circumstances of their affairs, the Transactions had happened for any length of time to be intermitted. And this seems principally to have been done with a view to satisfy the Public, that their usual meetings were then continued, for the improvement of knowledge, and benefit of mankind, the great ends of their first institution by the Royal Charters, and which they have ever since steadily pursued. But the Society being of late years greatly enlarged, and their communications more numerous, it was thought advisable that a Committee of their members should be appointed, to reconsider the papers read before them, and select out of them such as they should judge most proper for publication in the future Transactions; which was accordingly done upon the 26th of March 1752. And the grounds of their choice are, and will continue to be, the importance and singularity of the subjects, or the advantageous manner of treating them; without pretending to answer for the certainty of the facts, or propriety of the reasonings, contained in the several papers so published, which must still rest on the credit or judgement of their respective authors. It is likewise necessary on this occasion to remark, that it is an established rule of the Society, to which they will always adhere, never to give their opinion, as a Body, upon any subject, either of Nature or Art, that comes before them. And therefore the thanks, which are frequently proposed from the Chair, to be given to the authors of such papers as are read at their accustomed meetings, or to the persons through whose hands they received them, are to be considered in no other light than as a matter of civility, in return for the respect shown to the Society by those communications. The like also is to be said with regard to the several projects, inventions, and curiosities of various kinds, which are often exhibited to the Society; the authors whereof, or those who exhibit them, frequently take the liberty to report and even to certify in the public newspapers, that they have met with the highest applause and approbation. And therefore it is hoped that no regard will hereafter be paid to such reports and public notices; which in some instances have been too lightly credited, to the dishonour of the Society. The Meteorological Journal hitherto kept by the Assistant Secretary at the Apartments of the Royal Society, by order of the President and Council, and published in the Philosophical Transactions, has been discontinued. The Government, on the recommendation of the President and Council, has established at the Royal Observatory at Greenwich, under the superintendence of the Astronomer Royal, a Magnetical and Meteorological Observatory, where observations are made on an extended scale, which are regularly published. These, which correspond with the grand scheme of observations now carrying out in different parts of the globe, supersede the necessity of a continuance of the observations made at the Apartments of the Royal Society, which could not be rendered so perfect as was desirable, on account of the imperfections of the locality and the multiplied duties of the observer. 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A List of Public Institutions and Individuals, entitled to receive a copy of the Astronomical Observations (including Magnetism and Meteorology) made at the Royal Observatory at Greenwich, on making application for the same directly or through their respective agents, within two years of the date of publication. | Observatories | Institutions | |-----------------------|--------------------------------------------------| | Altona | Aberdeen University | | Armagh | Berlin Academy | | Berlin | Bologna Academy | | Breslau | Boston American Academy of Sciences | | Brussels | Brunswick, U.S., Bowdoin College | | Cadiz | Cambridge Trinity College Library | | Cambridge | Cambridge, U.S., Harvard University | | Cape of Good Hope | Dublin University | | Coimbra | Edinburgh University | | Copenhagen | Glasgow University | | Dorpat | Göttingen University | | Dublin | Leyden University | | Edinburgh | London Board of Ordnance | | Helsingfors | Königsberg Queen’s Library | | Königsberg | Madras Royal Institution | | Madras | Mannheim Royal Society | | Mannheim | Marseilles Savilian Library | | Milan | Oxford Academy of Sciences | | Munich | Paris Board of Longitude | | Oxford | Pesth Hungarian Academy | | Palermo | Philadelphia American Philosophical Society | | Paris | Philadelphia American Philosophical Society | | Seeberg | St. Andrews University | | Trevandrum | St. Petersburgh Impérial Academy | | Tübingen | Stockholm Royal Academy of Sciences | | Turin | Upsal Royal Society | | Vienna | Waterville (U.S.), College | | Wilna | | | Individuals | | |-----------------------| | | Christie, S. H., Esq. | Twickenham | | Lubbock, Sir John William, Bart. | London. | | Lowndes Professor of Astronomy | Cambridge. | | Plumian Professor of Astronomy | | | President of the Royal Society | London. | | Ross, Rear-Admiral Sir J. C. | Aylesbury. | | Smyth, Rear-Admiral W. H. | Aylesbury. | | South, Sir James | Kensington. | | The Earl of Rosse | Parsonstown. | A List of Observatories, Institutions and Individuals, entitled to receive a Copy of the Magnetical and Meteorological Observations made at the Royal Observatory, Greenwich. | Observatories | Individuals | |-------------------------------|----------------------------------| | Bombay | Bache, Dr. A. D. | | Cairo | Barlow, P. W., Esq. | | Cambridge, United States | Ballot, Dr. Buys | | Christiania | Demidoff, Prince Anatole de | | Gotha | Dove, Prof. H. W. | | Heidelberg | Erman, Dr. Adolph | | Kew | Fox, R. W., Esq. | | Kremsmünster | Gilliss, Lt. J. M., U.S. Navy | | Leipsic | Harris, Sir W. Snow | | Marburg | Howard, Luke, Esq. | | Prague | Humboldt, Baron von | | Stockholm | Kaemtz, Prof. L. F. | | Toronto | Kreil, Prof. K. | | Upsal | Kupffer, A. T. | | Washington | (Twelve copies for distribution to the Russian Mag. and Met. Obs.) | | | Lloyd, Rev. Dr. | | | Loomis, Professor | | | Lovering, Professor | | | Melvill, Sir J. C. | | | Pegado, Dr. | | | Phillips, John, Esq. | | | Quetelet, A. | | | Reid, Major-Gen. Sir W., R.E. | | | Riddell, Lieut.-Colonel, R.A. | | | Sabine, Major-General, R.A. | | | Senftenberg, Baron von | | | Vernon, G. V., Esq. | | | Wartmann, Professor Elie | | | Younghusband, Capt., R.A. | | Institutions | | |-------------------------------|--------------------------------| | Bombay | Geographical Society. | | Bonn | University. | | Bowditch Library | United States. | | Cambridge | Philosophical Society. | | Cherkow | University. | | Falmouth | Royal Cornwall Polytechnic Society. | | London | House of Lords, Library. | | | House of Commons, Library. | | | King's College. | | | Royal Society. | | | University College, Library. | | Oxford | Radcliffe Observatory. | | Paris | Meteorological Society. | | St. Bernard | Convent. | | Washington | Smithsonian Institution. | | Woolwich | Office of Mag. and Met. Publ. | ## CONTENTS I. The Bakerian Lecture.—On the Stratifications and Dark Band in Electrical Discharges as observed in Torricellian Vacua. By John P. Gassiot, V.P.R.S. II. A Memoir on the Theory of Matrices. By Arthur Cayley, Esq., F.R.S. III. A Memoir on the Automorphic Linear Transformation of a Bipartite Quadric Function. By Arthur Cayley, Esq., F.R.S. IV. Supplementary Researches on the Partition of Numbers. By Arthur Cayley, Esq., F.R.S. V. An Account of some recent Researches near Cairo, undertaken with the view of throwing light upon the Geological History of the Alluvial Land of Egypt.—Instituted by Leonard Horner, Esq., Vice-President of the Royal Society, Fellow of the Royal Society of Edinburgh, and Vice-President of the Geological Society. VI. Researches on the Structure and Homology of the Reproductive Organs of the Annelids. By Thomas Williams, M.D., F.R.S., Physician to the Swansea Infirmary. Communicated by Thomas Bell, Esq., F.R.S., President of the Linnean Society, &c. VII. On the Partitions of the R-Pyramid, being the first class of R-gonous X-edra. By the Rev. Thomas P. Kirkman, M.A., F.R.S., Rector of Croft with Southworth. VIII. On the Isolation of the Radical, Mercuric Methyl. By George Bowdler Buckton, Esq., F.R.S. IX. Description of the Skull and Teeth of the Placodus laticeps, Owen, with indications of other new Species of Placodus, and evidence of the Saurian Nature of that Genus. By Professor Owen, V.P.R.S., Superintendent of the Natural History Departments in the British Museum. X. On the Properties of Electro-deposited Antimony. By G. Gore, Esq. Communicated by Dr. Tyndall, F.R.S. XI. On the Constitution of the Essential Oil of Rue. By C. Greville Williams, Lecturer on Chemistry in the Normal College, Swansea. XII. On the Action of Ammonia on Glyoxal. By Dr. H. Debus. Communicated by Professor Tyndall, F.R.S. XIII. On some Physical Properties of Ice. By John Tyndall, F.R.S., Professor of Natural Philosophy in the Royal Institution of Great Britain XIV. Researches on the Intimate Structure of the Brain, Human and Comparative.—First Series. On the Structure of the Medulla oblongata. By J. Lockhart Clarke, Esq., F.R.S. XV. On the Megatherium (Megatherium Americanum, Cuvier and Blumenbach).—Part IV. Bones of the Anterior Extremities. By Professor Owen, V.P.R.S., Superintendent of the Natural History Departments in the British Museum. LIST OF ILLUSTRATIONS. Plate I.—Mr. Gassiot on the Stratifications and Dark Band in Electrical Discharges as observed in Torricellian Vacua. Plates II. III. IV. V.—Mr. Horner on the Alluvial Land of Egypt. Plates VI. VII. VIII.—Dr. T. Williams's Researches on the Structure and Homology of the Reproductive Organs of the Annelids. Plates IX. X. XI.—Professor Owen on the Skull and Teeth of the Placodus laticeps. Plates XII. XIII. XIV. XV. XVI. XVII.—Mr. J. Lockhart Clarke on the Intimate Structure of the Brain, Human and Comparative. Plates XVIII. XIX. XX. XXI. XXII.—Professor Owen on the Megatherium. CONTENTS. XVI. On the Anatomy and Physiology of the Spongiadae. By J. S. Bowerbank, LL.D., F.R.S., F.L.S. &c. ........................................... page 279 XVII. On the Physical Structure of the Old Red Sandstone of the County of Waterford, considered with relation to Cleavage, Joint Surfaces, and Faults. By the Rev. Samuel Haughton, M.A., F.G.S., Fellow of Trinity College, and Professor of Geology in the University of Dublin. Communicated by Professor Tyndall, F.R.S. .......................................................................................... 333 XVIII. On the Relative Power of Metals and Alloys to conduct Heat.—Part I. By F. Crace Calvert, Esq., F.C.S., Corr. Mem. Roy. Acad. Turin, Société de Pharmacie, Paris, &c.; and Richard Johnson, Esq., F.C.S. &c. Communicated by Professor Stokes, Sec. R.S. ......................................................................................... 349 XIX. On the Thermo-electric Series. By Augustus Matthiessen, Ph.D. Communicated by Charles Wheatstone, Esq., F.R.S. .................................................................................................... 369 XX. On the Electric Conducting Power of the Metals. By Augustus Matthiessen, Ph.D. Communicated by Charles Wheatstone, Esq., F.R.S. .................................................................................................... 383 XXI. On the Resistance of Tubes to collapse. By William Fairbairn, Esq., C.E., F.R.S. &c. .................................................................................................................. 389 XXII. A Fourth Memoir upon Quantics. By Arthur Cayley, Esq., F.R.S. .................................................................................................................. 415 XXIII. A Fifth Memoir upon Quantics. By Arthur Cayley, Esq., F.R.S. .................................................................................................................. 429 XXIV. On the Tangential of a Cubic. By Arthur Cayley, Esq., F.R.S. .................................................................................................................. 461 XXV. Astronomical Experiment on the Peak of Teneriffe, carried out under the sanction of the Lords Commissioners of the Admiralty. By Professor C. Piazzi Smyth. Communicated by G. B. Airy, Esq., Astronomer Royal .................................................................................................................. 465 XXVI. On Curves of the Third Order. By the Rev. George Salmon, Trinity College, Dublin. Communicated by Arthur Cayley, Esq., F.R.S. .................................................................................................................. 535 XXVII. On the Magnetic Induction of Crystals. By Professor Julius Plücker, of Bonn, F.M.R.S., H.M.R.I. .................................................................................................................. 543 XXVIII. On the Development of Decapod Crustacea. By C. Spence Bate, F.L.S. &c. Communicated by Sir W. Snow Harris, F.R.S. . . . . . . . . . . . . . . 589 XXIX. An Inquiry regarding the parts of the Nervous System which regulate the contractions of the Arteries. By Joseph Lister, Esq., F.R.C.S. Eng. and Edin., Assistant Surgeon to the Royal Infirmary, Edinburgh. Communicated by Dr. Sharpey, Sec. R.S. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 607 XXX. On the Cutaneous Pigmentary System of the Frog. By Joseph Lister, Esq., F.R.C.S. Eng. and Edin., Assistant Surgeon to the Royal Infirmary, Edinburgh. Communicated by Dr. SharpEy, Sec. R.S. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 627 XXXI. On the Early Stages of Inflammation. By Joseph Lister, Esq., F.R.C.S. Eng. and Edin., Assistant Surgeon to the Royal Infirmary, Edinburgh. Communicated by Dr. SharpEy, Sec. R.S. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 645 XXXII. On the Structure of Lavas which have consolidated on steep slopes; with Remarks on the Mode of Origin of Mount Etna, and on the Theory of “Craters of Elevation.” By Sir Charles Lyell, F.R.S., D.C.L. . . . . . . . . . . . . . 703 XXXIII. Note on Archdeacon Pratt’s Paper “On the Effect of Local Attraction in the English Arc.” By Captain A. R. Clarke, R.E. Communicated by Lieut.-Colonel James, R.E. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 787 XXXIV. On the Organization of the Brachiopoda. By Albany Hancock, Esq. Communicated by T. H. Huxley, Esq., F.R.S. . . . . . . . . . . . . . . . 791 XXXV. On Chondrosteus, an Extinct Genus of the Sturionidae, found in the Lias Formation at Lyme Regis. By Sir Philip de Malpas Grey Egerton, Bart., M.P., F.R.S., F.G.S. &c. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 871 XXXVI. On the Influence of Temperature on the Refraction of Light. By the Rev. T. P. Dale, M.A., F.R.A.S., and Dr. J. H. Gladstone, F.R.S. . . . . 887 XXXVII. On the Structure and Functions of the Hairs of the Crustacea. By Campbell De Morgan, Surgeon to the Middlesex Hospital. Communicated by George Busk, Esq. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 895 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 905 Appendix. Presents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [ 1 ] LIST OF ILLUSTRATIONS. Plates XXIII. XXIV. XXV. XXVI.—Dr. J. S. Bowerbank on the Anatomy and Physiology of the Spongiadæ. Plate XXVII.—Mr. Crace Calvert and Mr. R. Johnson on the Relative Power of Metals and Alloys to conduct Heat. Plates XXVIII. XXIX.—Mr. Fairbairn on the Resistance of Tubes to collapse. Plates XXX. XXXI. XXXII. XXXIII. XXXIV. XXXV. XXXVI. XXXVII. XXXVIII. XXXIX.—The Admiralty Astronomical Experiment on the Peak of Teneriffe. Plates XL. XLI. XLII. XLIII. XLIV. XLV. XLVI.—Mr. C. Spence Bate on the Development of Decapod Crustacea. Plates XLVII. XLVIII.—Mr. J. Lister on the Cutaneous Pigmentary System of the Frog. Plates XLIX. L. LI.—Sir Charles Lyell on the Structure of Lavas which have consolidated on steep slopes. Plates LII. LIII. LIV. LV. LVI. LVII. LVIII. LIX. LX. LXI. LXII. LXIII. LXIV. LXV. LXVI.—Mr. Hancock on the Organization of the Brachiopoda. Plates LXVII. LXVIII. LXIX. LXX.—Sir P. G. Egerton on Chondrosteus, an Extinct Genus of the Sturionidæ. Plate LXXI.—Mr. C. De Morgan on the Structure and Functions of the Hairs of the Crustacea. ADJUDICATION of the Medals of the Royal Society for the year 1858 by the President and Council. The Copley Medal to Sir Charles Lyell, for his various Researches and Writings by which he has contributed to the advance of Geology. A Royal Medal to Mr. Albany Hancock, for his various Researches on the Anatomy of the Mollusca. A Royal Medal to Mr. William Lassell, for his various Astronomical Discoveries and Researches. The Rumford Medal to M. Jules Jamin, for his various Experimental Researches on Light. The Bakerian Lecture was delivered by J. P. Gassiot, Esq., F.R.S., and entitled "On the Stratifications and Dark Band in Electrical Discharges as observed in Torricellian Vacua." The Croonian Lecture was delivered by T. H. Huxley, Esq., F.R.S., and entitled "On the Theory of the Vertebrate Skull." XII. On the Action of Ammonia on Glyoxal. By Dr. H. Debus. Communicated by Professor Tyndall, F.R.S. ................................................................. page 205 XIII. On some Physical Properties of Ice. By John Tyndall, F.R.S., Professor of Natural Philosophy in the Royal Institution of Great Britain .................................................. 211 XIV. Researches on the Intimate Structure of the Brain, Human and Comparative.—First Series. On the Structure of the Medulla oblongata. By J. Lockhart Clarke, Esq., F.R.S. ........................................................................................................... 231 XV. On the Megatherium (Megatherium Americanum, Cuvier and Blumenbach).—Part IV. Bones of the Anterior Extremities. By Professor Owen, V.P.R.S., Superintendent of the Natural History Departments in the British Museum. .................................................................................................................................................................................. 261 XVI. On the Anatomy and Physiology of the Spongiadae. By J. S. Bowerbank, LL.D., F.R.S., F.I.S. &c. .................................................................................................................................................................................. 279 XVII. On the Physical Structure of the Old Red Sandstone of the County of Waterford, considered with relation to Cleavage, Joint Surfaces, and Faults. By the Rev. Samuel Haughton, M.A., F.G.S., Fellow of Trinity College, and Professor of Geology in the University of Dublin. Communicated by Professor Tyndall, F.R.S. .................................................................................................................................................................................. 333 XVIII. On the Relative Power of Metals and Alloys to conduct Heat.—Part I. By F. Crace Calvert, Esq., F.C.S., Corr. Mem. Roy. Acad. Turin, Société de Pharmacie, Paris, &c.; and Richard Johnson, Esq., F.C.S. &c. Communicated by Professor Stokes, Sec. R.S. .................................................................................................................................................................................. 349 XIX. On the Thermo-electric Series. By Augustus Matthiessen, Ph.D. Communicated by Charles Wheatstone, Esq., F.R.S. .................................................................................................................................................................................. 369 XX. On the Electric Conducting Power of the Metals. By Augustus Matthiessen, Ph.D. Communicated by Charles Wheatstone, Esq., F.R.S. .................................................................................................................................................................................. 383 XXI. On the Resistance of Tubes to collapse. By William Fairbairn, Esq., C.E., F.R.S. &c. .................................................................................................................................................................................. 389 XXII. A Fourth Memoir upon Quantics. By Arthur Cayley, Esq., F.R.S. .................................................................................................................................................................................. 415 XXIII. A Fifth Memoir upon Quantics. By Arthur Cayley, Esq., F.R.S. .................................................................................................................................................................................. 429 XXIV. On the Tangential of a Cubic. By Arthur Cayley, Esq., F.R.S. .................................................................................................................................................................................. 461 XXV. Astronomical Experiment on the Peak of Teneriffe, carried out under the sanction of the Lords Commissioners of the Admiralty. By Professor C. Piazzi Smyth. Communicated by G. B. Airy, Esq., Astronomer Royal .................................................................................................................................................................................. 465 XXVI. On Curves of the Third Order. By the Rev. George Salmon, Trinity College, Dublin. Communicated by Arthur Cayley, Esq., F.R.S. .................................................................................................................................................................................. 535 XXVII. On the Magnetic Induction of Crystals. By Professor Julius Plücker, of Bonn, F.M.R.S., H.M.R.I. .................................................. page 543 XXVIII. On the Development of Decapod Crustacea. By C. Spence Bate, F.L.S. &c. Communicated by Sir W. Snow Harris, F.R.S. ........................................... 589 XXIX. An Inquiry regarding the parts of the Nervous System which regulate the contractions of the Arteries. By Joseph Lister, Esq., F.R.C.S. Eng. and Edin., Assistant Surgeon to the Royal Infirmary, Edinburgh. Communicated by Dr. Sharpey, Sec. R.S. ................................................................................................................. 607 XXX. On the Cutaneous Pigmentary System of the Frog. By Joseph Lister, Esq., F.R.C.S. Eng. and Edin., Assistant Surgeon to the Royal Infirmary, Edinburgh. Communicated by Dr. Sharpey, Sec. R.S. ................................................................................................................. 627 XXXI. On the Early Stages of Inflammation. By Joseph Lister, Esq., F.R.C.S. Eng. and Edin., Assistant Surgeon to the Royal Infirmary, Edinburgh. Communicated by Dr. Sharpey, Sec. R.S. ................................................................................................................. 645 XXXII. On the Structure of Lavas which have consolidated on steep slopes; with Remarks on the Mode of Origin of Mount Etna, and on the Theory of "Craters of Elevation." By Sir Charles Lyell, F.R.S., D.C.L. ................................................................................................................. 703 XXXIII. Note on Archdeacon Pratt's Paper "On the Effect of Local Attraction in the English Arc." By Captain A. R. Clarke, R.E. Communicated by Lieut.-Colonel James, R.E. ................................................................................................................. 787 XXXIV. On the Organization of the Brachiopoda. By Albany Hancock, Esq. Communicated by T. H. Huxley, Esq., F.R.S. ................................................................................................................. 791 XXXV. On Chondrosteus, an Extinct Genus of the Sturionidae, found in the Liass Formation at Lyme Regis. By Sir Philip de Malpas Grey Egerton, Bart., M.P., F.R.S., F.G.S. &c. ................................................................................................................. 871 XXXVI. On the Influence of Temperature on the Refraction of Light. By the Rev. T. P. Dale, M.A., F.R.A.S., and Dr. J. H. Gladstone, F.R.S. ................................................................................................................. 887 XXXVII. On the Structure and Functions of the Hairs of the Crustacea. By Campbell De Morgan, Surgeon to the Middlesex Hospital. Communicated by George Busk, Esq. ................................................................................................................. 895 Index ................................................................................................................. 905 APPENDIX. Presents ........................................................................................................... [ 1 ] LIST OF ILLUSTRATIONS. Plate I.—Mr. Gassiot on the Stratifications and Dark Band in Electrical Discharges as observed in Torricellian Vacua. Plates II. III. IV. V.—Mr. Horner on the Alluvial Land of Egypt. Plates VI. VII. VIII.—Dr. T. Williams's Researches on the Structure and Homology of the Reproductive Organs of the Annelids. Plates IX. X. XI.—Professor Owen on the Skull and Teeth of the Placodus laticeps. Plates XII. XIII. XIV. XV. XVI. XVII.—Mr. J. Lockhart Clarke on the Intimate Structure of the Brain, Human and Comparative. Plates XVIII. XIX. XX. XXI. XXII.—Professor Owen on the Megatherium. Plates XXIII. XXIV. XXV. XXVI.—Dr. J. S. Bowerbank on the Anatomy and Physiology of the Spongiadæ. Plate XXVII.—Mr. Crace Calvert and Mr. R. Johnson on the Relative Power of Metals and Alloys to conduct Heat. Plates XXVIII. XXIX.—Mr. Fairbairn on the Resistance of Tubes to collapse. Plates XXX. XXXI. XXXII. XXXIII. XXXIV. XXXV. XXXVI. XXXVII. XXXVIII. XXXIX.—The Admiralty Astronomical Experiment on the Peak of Teneriffe. Plates XL. XLI. XLII. XLIII. XLIV. XLV. XLVI.—Mr. C. Spence Bate on the Development of Decapod Crustacea. Plates XLVII. XLVIII.—Mr. J. Lister on the Cutaneous Pigmentary System of the Frog. Plates XLIX. L. LI.—Sir Charles Lyell on the Structure of Lavas which have consolidated on steep slopes. Plates LII. LIII. LIV. LV. LVI. LVII. LVIII. LIX. LX. LXI. LXII. LXIII. LXIV. LXV. LXVI.—Mr. Hancock on the Organization of the Brachiopoda. Plates LXVII. LXVIII. LXIX. LXX.—Sir P. G. Egerton on Chondrosteus, an Extinct Genus of the Sturionidæ. Plate LXXI.—Mr. C. De Morgan on the Structure and Functions of the Hairs of the Crustacea.