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Messina. With further Notes on its Structure and Affinities, by 
Henry B. Brapy, F.L.S., F.G.S. (Plate XIIL.)......0......... 333 
XLII. Description of a rare Indian Clausila. By SyLvanus 
MM RRS OR ik cecac gins oes newueniess epee weds 343 
XLIV. Remarks on some Species of Oliva recently described by 
Mr, Frederick P. Marrat. By T. Grauam Ponton, F.Z.S. ...... 344 
XLY. Notes on the Remains of some Reptiles and Fishes from the 
Shales of the Northumberland Coal-field. By Atpany Hancock, 
F.L.S., and Toomas AtrHzry. (Plates XIV., XV., XVIL)........ 346 
XLVI. On the Development of the Position of the Eyes in Pleu- 
ronectide. By Prof. J. C. Scm1éptE. Communicated by C. A. 
GG ihe cick a os 5 ey oo eters kb booed by ge gees 378 
New Book :—The Birds of South Africa. A descriptive Catalogue of 
all the known Species occurring south of the 28th Parallel of 
South Latitude, by Edgar Leopold Layard, F.Z.S. &......... 383 
Natica catenata (Philippi), by T. Graham Ponton ; Balatro calvus, a 
* new Genus and Species of Rotatoria entirely destitute of Vibra- 
tile Cilia, by E. Claparéde ; Occurrence of Terebratula ( Wald- 
yee pseudo-jurensis ene in England, by J. F.Walker, 
B.A., F.G.S. &e.; Fossil Ivory ; On the Union of the Tympanic 
Bone with the Lower Jaw occurring in the Marsupials during 
Development, as a fresh proof of the agreement of this bone 
with the Os quadratum of the other classes of Vertebrata, by 
Prof. W. Peters; On the Tympanic Bone and Ossicles of the 
Ear in the Monotremata, in connexion with the question of the 
interpretation of the Quadrate Bone in Birds, by Prof. W.Peters; 
Leucodore calearea, by E. Ray Lankester ; On the Growth of the 
Stem of Fontinalis antipyretica, by Prof. H. Leitgeb...... 385—392 
NUMBER VI. 
XLVII. On Balanus armatus, and a Hybrid between this Species 
and Balanus improvisus, var. assimilis, Darw. By Dr. Fritz MULuEr. 
EES EES Sa a a errant 393 
XLVIII. Sixth Account of new Species of Snakes in the Collec- 
tion of the British Museum. By Atpurr Gintuer, M.A., M.D., 
Pers, Pat, (Plates XVIL, XVIII, XIX.).............000tee 413 
XLIX. On the Terrestrial Mollusca of Dominica and Grenada; 
with an Account of some new Species from Trinidad. By R, J. 
Wepre Gorry, BES. P.GS., BG... pes enesseees 429 
L. Carcinological Gleanings. No. III. By C. Spence Barr, 
aq, ©.0.5, (Plate XXL) ............; SCs eat NAS Sela 442 
LI. On Eugereon Boeckingi and the Genealogy of the Arthropoda. 
AER 5 8 0 ign FE Ree Fare Cnr ae 448 
