CONTENTS OF VOL. TX. 



[SECOND SERIES.] 



NUMBER XLIX. 



Page 



I. Notes on the Diatomacece ; with descriptions t)f British species 

 inckided in the genus Pleurosigma. By the Rev. Wm. Smith, F.L.S. 

 (With two Plates.) 1 



II. Notice of a new British Viola. By Charles C. Babington, 

 M.A., F.R.S 12 



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

 Structure, Functions, (Economy, and Systematic Arrangement. By 

 John Blackwall, F.L.S 15 



IV. Upon the Development of Mollusks in Holothurice. By 

 Prof. MiJLLER A... 22 



V. Notes on Chalcidites, and descriptions of various new species. 



By Francis Walker, F.L.S 39 



VI. Descriptions of some Hymenopterous Insects captured in India, 

 with notes on their GEconoray. By Frederick Smith, Assistant 

 Zoological Department, British Museum 44 



New Books: — A Naturalist's Sojourn in Jamaica, by P. H. Gosse. — 

 Man and his Migrations, by R. G. Latham, M.D., F.R.S. &c.— 

 The Ethnology of the British Colonies and Dependencies, by R. 

 G. Latham, Esq., M.D. &c. — Revue des Odonates ou Libellules 

 d'Europe, par Edm. de Selys-Longchamps. Avec la collaboration 

 de M. le Docteur Hagen 50 — 57 



Proceedings of the Zoological Society; Botanical Society of Edin- 

 burgh 58—73 



Notice of the Occurrence of the Black Tern, Sterna nigra, Linn., near 

 Coldstream, by John Alexander Smith, M.D. ; On the Circulation 

 of the Blood, and Nutrition in Insects, by M. Emile Blanchard 



