IV CONTENTS. 



Page 

 siliu Mortillcti in Kent, h\ W. H. Uoiison ; On the Siliceous 

 Sporniipial Slientli of the Diatomacetr. by J. W. (JiiHitli, M.D. ; 

 Travels iu Central America, by MM. Sclierzer and Waj^ner ; On 

 the Non-cxistencT of Polarizing Silica in the Organic King- 

 (luius, by Prof. .1. W. Bailey; Meteorological Observations and 

 Table ". 73—80 



NUMBER CIV. 



IX. On the Development and Propagation of Sphcsroplea annulina. 



By Dr. Ferdinand Cohn 81 



X. New Terrestrial Shells from Ceylon, with a General List of the 

 Species inhabiting that Island. By W. II. Bi:n.son, Esq 94 



XI. Notice of a curious Metamorphosis in a Polype-like Animal. 

 By C. W. Peach, Member of the Royal Physical Society of Edin- 

 burgh. (With a Plate.) 99 



XII. Brief Outline of the Anatomy of the genus Atlas (Lesueur). 



By John Denis Macdonald, R.N. (With a Plate.) 101 



XIII. Ou the Develo])nient oi Arenicola piscatorum ; with Remarks 

 upon tliat of other Branchiferous Annelides. By Dr. Max Schultze. 

 (With a Plate.) 105 



XIV. Notes on the Freshwater Infusoria of the Island of Bombay. 

 No. 1. Organization. By II. J. Carter, Esq., Assistant-Surgeon 

 H.C.S., Bombay. (With three Plates.) 115 



XV. Monograjjh of the genus Catops. By Andrew Murray ... 133 



XVI. On a new British species of Skenea. By W. Webster, Esq. 

 (With a Plate.) 156 



XVII. Description of a New Si)ecies of Dolphin (Steno) from the 

 uj)per parts of the River Amazon. By J. E. Gray, Ph.D., F.R.S. &c. 157 



New Books : — Manual of Geology, Practical and Theoretical, by John 

 Phillips, M.A., F.R.S. &c.— Tenby : a Sea-side Holiday, by Philip 

 Henry Gosse, A.L.S. — Manual of British Botany, containing the 

 Flowering Plants and Ferns arranged according to the Natural 

 Orders, by Charles Cardale Babington, M.A., F.R.S., F.L.S. &e. 

 Fourth Edition. — Trees and their Nature, or the Bud and its 

 Attributes, by Alex. Har\'ey, A.M., M.D. &e 15y— Kifi 



Proceedings of the Zoological Society ; Botanical Society of Edin- 

 burgh 166—183 



On the pn)))able Origin of the Organized Beings now living in the 

 Azores, Madeira, and the Canaries, by M. Os\\ald Ilecr. — Note 



