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, H.M. Indian Forces 1 



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

 new Species in the British Museum. By Dr. JOHN 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 27 



V. On the Development of Pyrosoma. By THOMAS H. HUXLEY, 

 F.R.S., F.L.S., Professor of Natural 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. H. Lewes, Esq.; 

 On a new Species of Odontophorus, by John Gould, F.R.S. &c. 7072 



NUMBER XXVI. 



VII. Descriptions of a Zoophyte and two Species of Echinodermata 

 new to Britain. By JOSHUA ALDER, Esq. (With a Plate.) 73 



VIII. On the Tribe Cottetiea, 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 76 



