[ V ] 
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 page 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. Bond. 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 Iloltenia, a Genus of Vitreous Sponges. By Wyville Thomson, LL.D., 
F.R.S., Professor of Natural Science in Queens College, Belfast . . . . 701 
XXVIII. Description of Parkeria and Loftusia, two gigantic types of Arenaceous Fora- 
minifera. 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 
Presents 
Appendix. 
[ i ] 
ERRATA. 
Page 134, last line of Note, insert + before 2<p. 
Page 158, in 5th. column of Table, the number in line b. should be 24, and in line c. should be 5. 
Page 575, line 9, for 1826 read 1845. 
