CONTENTS. VU 



Page 

 New Books : — The Geological Observer, by Sir H. T. De la Beche, 

 C.B., F.R.S. &e., Director-General of the Geological Survey of 

 the United Kingdom 409 



Proceedings of the Zoological Society; Linnsean Society; Botanical 



Society of Edinburgh 412—426 



An account of three new species of Animalcules, by Joshua Alder, Esq. ; 

 Note on the Bird-devoui*ing habit of a species of Spider, by Capt. 

 W. S. Sherwill ; On the Conjugation of Diplozoon paradoxum, by 

 Prof. Th. von Siebold ; On a Leech new to the British Fauna, 

 by J. E. Gray, Esq., F.R.S. ; Government Manufacture and Pub- 

 lication of School-books and Elementary Works of Science ; Cen- 

 trolophus pompilus or Black-fish ; Description of a new Crusta- 

 cean, by W. Baird, M.D., F.L.S. &c. ; Meteorological Observa- 

 tions and Table 426—432 



NUMBER XLII. 



XLII. A Stratigi'aphical Account of the Section of Hordwell, 

 Beacon, and Barton Clifi's, on the coast of Hampshire. By Thomas 

 Wright, M.D. &c 433 



XLIII. A Catalogue of British Spiders, including remarks on their 

 Structm-e, Functions, (Economy and Systematic Arrangement. By 

 John Blackwall, F.L.S 446 



XLFV. Contributions to the Botany of South America. By John 

 MiERS, Esq., F.R.S., F.L.S 452 



XLV. On the distinctive characters of Jeffreysia and Chemnitzia. 

 By Joshua Alder, Esq 460 



XL VI. On Chemnitzia and other MoUusca, in answer to Mr. Clark. 

 By J. GwYN Jeffreys. (With a Plate.) 465 



XLVIL On the Classification of the British Marine Testaceous 

 MoUusca. By William Clark, Esq 469 



XLVIII. On the Tetrasporic Fruit of the genus Stenogramme. In 

 a letter from Dr. C. Montagne to the Rev. M. J. Berkeley, M.A., 

 F.L.S 481 



XLIX. On some British species of Chemnitzia. By George Bar- 

 lee, Esq 482 



New Books: — A Geological Inquiry respecting the Water-bearing 

 Strata of the country around London, with reference especially to 

 the Water-Supply of the MetropoUs, by J. Prestwich, Jun., F.G.S. 

 — Drops of Water : their marvellous and beautiful Inhabitants 

 displayed by the Microscope, by Agnes Catlow 486 — 488 



