CONTENTS. Vll 



Page 



XXXVII. On the Affinities of the genus Camptonyx, Benson. By 

 Dr. J.E. Gray,F.R.S. &c 406 



XXXVIII. Characters of Tanysiphon, a new genus of Fluviatile 

 Shells allied to the Myacidce. By W. H. Benson, Esq. (With a 

 Plate.) 407 



XXXIX. Observations on Dracunculus in the Island of Bombay. 



By H. J. Carter, Esq., H.C.S. Bombay 410 



XL. Synopsis of the Families, Genera, and Species of the British 

 Actini(B. ' By P. H. Gosse, F.R.S 414 



XLI. Note on the Cell-contents of Closterium. By Arthur 

 Henfrey, F.R.S. &c 419 



XLII. On the Development of the Shell and Tube of Aspergillum. 

 By Dr. J. E. Gray, F.R.S. &c 423 



XLIII. Descriptions of six newly discovered Species and Characters 

 of a new Genus of Araneidea. By John Blackwall, F.L.S 426 



XLIV. On the Existence of a Sexual Reproduction in the Infusoria. 

 By M. Balbiani 435 



New Book : — A Cyclopaedia of the Natural Sciences, by William 



Baird, M.D., F.L.S 438 



Proceedings of the Zoological Society; Botanical Society of Edin- 

 burgh 440—456 



Prof. Owen's Lectures on Palaeontology ; On the Teeth of the Black 

 and Wood Shell Slugs, by Dr. J. E. Gray, F.R.S. &c. ; Note on 

 the Anatomy of Cyclostoma elegans, by E. Claparede ; On the 

 Fecundation of the Crustacea, by M. Coste; On the Dorsal 

 Cavity of certain Ammonites, by Prof. Quenstedt ; Note on the 

 Larva of the Spiny Lobster (Palinurus), by M. Coste; On the 

 Organization of the genera Phyllosoma and Sapphirina, by Prof. 

 Gegenbaur ; On the Metamorphosis of the Pranizce into Ancei, 

 by M. Hesse 456—467 



Index 468 



