Erratum

XXIII. Researches into the Chemical Constitution of Narcotine, and of its Products of Decomposition.—Part III. By Augustus Matthiessen, F.R.S., Lecturer on Chemistry in St. Bartholomew's Hospital . . . . . . . . . . . . . . . . . . 661 XXIV. Researches into the Chemical Constitution of Narcotine, and of its Products of Decomposition.—Part IV. By Augustus Matthiessen, F.R.S., Lecturer on Chemistry in St. Bartholomew's Hospital, and C. R. A. Wright, B.Sc.Lond. 667 XXV. Researches on Vanadium.—Part II. By Henry E. Roscoe, B.A., Ph.D., F.R.S. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 679 XXVI. On Palaeocoryne, a Genus of Tubularine Hydrozoa from the Carboniferous Formation. By P. Martin Duncan, F.R.S., Sec. Geol. Soc., and H. M. Jenkins, F.G.S., Sec. Royal Agric. Soc. . . . . . . . . . . . . . . . . . . . . . . . . 693 XXVII. On Holtenia, a Genus of Vitreous Sponges. By Wyville Thomson, LL.D., F.R.S., Professor of Natural Science in Queen's College, Belfast . . . . . . . . . . 701 XXVIII. Description of Parkeria and Loftusia, two gigantic types of Arenaceous Foraminifera. By William B. Carpenter, M.D., V.P.R.S., and Henry B. Brady, F.L.S. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 721 XXIX. On the Structure and Development of the Skull of the Common Fowl (Gallus domesticus). By William Kitchen Parker, F.R.S. . . . . . . . . . . . . . . . . . . . . . . 755 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 809 APPENDIX. Presents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [ 1 ] ERRATUM. Page 575, line 9, for 1826 read 1845.