vi 
Gray, Grorce Rosert, Esq., F.L.S., F.Z.8. &e. page 
Descriptions of Two New Species of Ptilonopus ........ 48 
On a New Species of Thalassidroma........ ......... 62 
GuLLIVER, GroreGE, Esq., F.R.S. 
Notes on a Cetaceous Animal stranded on the North-east 
COARCLOLRUEC IANA A er ek ee ga oe aoe Coase aoa. cou he  Beae Chaka scale 
Newcoms, W., Esq., M.D. &c. 
Descriptions of Seventy-nine New Species of Achatinedla, 
Swainson, a genus of Pulmoniferous Mollusks, in the Collec- 
tion OF een Cre Beg, cs osu es cues ax os DOS 
Owen, Professor, F.R.S. &c. 
On the Anatomy of the Walrus...................... 103 
Preirrer, Dr. L. 
Descriptions of Twenty-three New <i of Land igs 
from the Collection of Hugh Cuming, Esq. . Lae ae 
Descriptions of Eighteen New Species of Land Shells from 
the Collections of Mr. Dennison and Mr. Cuming ........ 57 
Descriptions of Nineteen New Species of Helicea, from the 
Collection of Hugh Cuming, Esq....................... 124 
Rewutter, M. 
On the Capture of Delphinus Orca in South Greenland .. 103 
Scuiépre, M. 
On some Staphylinide, found in the Nests of Termites .. 101 
SciaTer, Puirie Lutiey, Esq., F.Z.S. 
