CONTENTS. vn 



• Page 

 Messina. With further Notes on its Structure and Affinities, by 

 Henry B. Brady, F.L.S., F.G.S. (Plate XIII.) 333 



XLIII, Description of a rare Indian Clausilia. By Sylvanus 

 Hanley, Esq., F.L.S 343 



XLIV. Remarks on some Species of Olwa recently described by 

 Mr. Frederick P. Marrat. By T. Graham Ponton, F.Z.S 344 



XLV. Notes on the Remains of some Reptiles and Fishes from the 

 Shales of the Northumberland Coal-field. By Albany Hancock, 

 F.L.S., and Thomas Atthey. (Plates XIV., XV., XVI.) 346 



XL VI. On the Development of the Position of the Eyes in Pleti- 

 ronedidce. By Prof. J. 0. Schiodte. Communicated by C. A. 

 Gosch, Esq 378 



Ne7v Book : — The Birds of South Africa. A descriptive Catalogue of 

 aU the known Species occurring south of the 28th Parallel of 

 South Latitude, by Edgar Leopold Layard, F.Z.S. &c 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. Claparede ; Occurrence of Terebratula ( Wald- 

 heimid) pseudo-jurensis (Leymerie) in England, by J. F. Walker, 

 B.A., F.G.S. &c. ; 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 calcarea, by E. Ray Lankester ; On the Growth of the 

 Stem of Fontinalis antipyretica, by Prof. H. Leitgeb 385 — 392 



NUMBER VI. 



XLVII. On Balanns armatus, and a Hybrid between this Species 

 and Balanus improvims, var. assimilis. Darw. By Dr. Fritz Muller. 

 (Plate XX.) 393 



XL VIII. Sixth Account of new Species of Snakes in the Collec- 

 tion of the British Museum. By Albert Gunther, M.A., M.D,, 

 Ph.D., F.R.S. (Plates XVIL, XVIIL, XIX.) 413 



XLIX. On the Terrestrial MoUusca of Dominica and Grenada; 

 with an Account of some new Species from Trinidad. By R. J. 

 Lechmere Guppy, F.L.S., F.G.S., &c 429 



L. Carcinological Gleanings. No. III. By C. Spence Bate, 

 Esq., F.R.S. (Plate XXI.) 442 



LI. On Eiigereon Boeckingi and the Genealogy of the Arthropoda. 

 By Dr. Anton Dohrn 448 



