Vlll CONTENTS. 



Page 

 Freshwater Sponges in the Tanks of Bombay. (Genus Spongilla.) By 

 H. J. Carter, Esq., Assistant Surgeon 303 



New Book : — Rare and Remarkable Animals of Scotland, represented 

 from living Subjects ; with practical Observations on their Nature, 

 by Sir John Graham Dalyell, Bart 311 



Proceedings of the Botanical Society of Edinburgh 315 



The Common Flea (Pulex irritans) ; Instance of a singular Anomaly 

 in the History of the Honey Bee, by George Darling, Esq. ; Me- 

 teorological Observations and Table 316 — 320 



NUMBER V. 



XXXII. On a new British species of Campy lodiscus. By W. C. 

 Williamson, Esq 321 



XXXIII. Notes of Diatomacece found in the stomachs of certain 

 Mollusca. By George Dickie, M.D., Lecturer on Botany in the Uni- 

 versity and King's College of Aberdeen 322 



XXXIV. Notice of a new species of Spiridens. By R. K. Greville, 

 LL.D. &c. (With a Plate.) 325 



XXXV. Notice of two new species of Ferns belonging to the genera 

 Oleandra and Po/ypodium. By R. K. Greville, LL.D. &c. (With 



a Plate.) 326 



XXXVI. Descriptions of Aphides. By Francis Walker, F.L.S. ... 328 



XXXVII. Note on the Cyclostomatous genus Pterocyclos, Benson 

 {Steganotoma, Troschel). By W. H. Benson, Esq., late Bengal Civil 

 Service 345 



XXXVIII. Description of some new Fossil Shells from Bissex Hill 

 and Springfield in Barbados. Communicated by Sir Robert H. 

 Schomburgk, Ph.D., Member of the Imp. Acad. Nat. Curios. &c. ... 347 



XXXIX. On the Insects of Jamaica. By Philip Henry Gosse, Esq. 349 

 XL. On the Ventriculidce of the Chalk ; their Classification. By 



J. Toulmin Smith, Esq. (With four Plates.) 352 



XLI. Remarks on the Migrations of Aphides. By Francis Walker, 

 F.L.S 372 



Neiv Books: — Flore de France, par M. Grenier et M. Godron. — A 

 Manual of the Botany of the Northern United States, from New 

 England to Wisconsin and south to Ohio and Pennsylvania inclu- 

 sive, arranged according to the Natural System, by A. Gray, M.D. 374 



Proceedings of the Linnasan Society; Royal Society 375 — 389 



On a new genus and species of Fossil Ruminantia, Po'ebrotherium Wil- 

 soni, by Joseph Leidy, M.D. ; On two new genera of Siliceous- 



