VI CONTENTS. 



Page 

 XXX. On Trichites, a fossil genus of Bivalve Mollusks. By John 

 Lycett, Esq. (With a Plate.) 343 



XXXT. Characters of nine new or imperfectly described species of 

 Planorbis inhabiting India and China. By W. H. Benson, Esq 348 



XXXII. Observations on the Littorinidce. By William Clark, 

 Esq 352 



XXXIII. Notices of British Fungi. By the Rev. M. J. Berkeley, 

 M.A, F.L.S., and C E. Broome, Esq. (With two Plates.) 365 



XXXIV. On the species of Cercolabes confounded under the name 



of C. prehensilis. By J. E. Gray, Esq., F.R.S., Pres. Bot. Soc. &c. ... 380 



XXXV. On the characteristic Fossils of the Chalk Formation. By 



L. Von Buch. Communicated by Prof. J. Nicol 381 



XXXVI. Descriptions of British Aphides. By Francis Walker, 

 F.L.S 388 



Proceedings of the Zoological Society ; Linnsean Society ; Botanical 



Society of Edinburgh 395 — 424 



On the Pathology of the Silk-Worm (Bombyx Mori, L.) ; Examination 

 of the Blood, by F. E. Gu6rin Meneville ; British Museum ; Echi- 

 nocactus Eyriesii, by J. Toulmin Smith, Esq. ; Cause of the Potato 

 Disease ; On the Nature of the Gregarince, by Dr. F. Stein ; Way 

 in which Toads shed their Skins ; Meteorological Observations and 

 Table 424—432 



NUMBER XXX. 



XXXVII. Notes on an Examination of Lamarck's species of Fossil 

 Terebratulce. By Thomas Davidson, Esq., Member of the Geol. Soc. 

 of France. Illustrated by figures of all the species drawn from the 

 original specimens. (With three Plates.) 433 



XXXVIII. On the Internal Structure of Terebratula pectuncu- 

 loides, Schl., Terebratula pulchella, Nils., and Terebratula Deslong- 

 champsii, nob. By Thomas Davidson, Esq. (With a Plate.) 449 



XXXIX. On some Inhabitants of the Freshwater Muscles. By 



C. Vogt 450 



XL. Notices of British Fungi. By the Rev. M. J. Berkeley, M.A., 



F.L.S., and C. E. Broome, Esq. (With two Plates.) 455 



XLI. On Hyoscyamus and Physochlcena. By John Miers, Esq., 



F.R.S., F.L.S 467 



XLII. On the genus Waltonia. By Thomas Davidson, Esq. (With 



a Plate.) 474 



