CONTENTS OF VOL. V. 



[THIRD SERIES.] 



NUMBER XXV. 



Page 



I. Observations on the Distribution and Habits of the Pelagic and 

 Freshwater Free-floating Diatomacese. By Surgeon G. C. Wallich, 

 M.D., Retired List, 11. M. Indian Forces I 



II. Revision of the Family PennatuUdce, with Descriptions of some 20 

 new Species in the British Museum, By Dr. Johx Edward Gray, 

 F.R.S., V.P.Z.S., P.E.S. &c. (With two Plates.) 20 



III. On the Burmese Genus Sophina. By W. H. Benson, Esq. . 26 



IV. On the Lepton sulcatulum of Mr. Gwyn Jeffreys. By Wil- 

 liam Clark, Esq 2/ 



V. On the Development of Pyrosoma. By Thomas H. Huxley, 

 F.R.S., F.L.S., Professor of Xatural History, Government School of 

 Mines , 29 



VI. On some new Anthribidce. By Francis P. Pascoe, F.L.S. 



&c. (With two Plates.) 35 



Proceedings of the Zoological Society; Geological Society 48 — 70 



On the Mud- Fish of the Nile {Lepidosiren annectensl), and Early 

 Notice of the Tapaia found in Pulo Condore, by Dr. J. E. Gray, 

 F.R.S. &c. ; New British Species of Hydra, by G. II. Lewes, Esq.; 

 On a new Species of Odonfophorus, by John Gould, F.R.S. &c. 70 — 72 



NUMBER XXVI. 



VII. Descriptions of a Zoopliyte and two Species of Echinodermata 

 new to Britain. By Jcsiila Alder, Esq. (With a Plate.) 7.3 



VIII. On the Tribe CoUetiece, with some Observations on the 

 Structure of the Seed in the Family of the Rhamnacece. By John 

 MiERS, F.R.S., F.L.S.&c jc, 



