

^^ 



CONTENTS OF VOL. IX. 



[FOUETH SERIES.] 



NUMBER XLIX. 



Page 



I. On the Ab^'ssal Theory of Light, the Protozoic-Absorption 

 Theory, and the Azoic-Mud Theory', propounded in the Reports of 

 H.M.S. 'Porcupine,' 1869 and 1870. By W. C. M'Intosh 1 



II. Seventh Account of new Species of Snakes in the Collection 

 of the British Museum. By Albert Guntheb, M. A., M.D., Ph.D., 

 F.R.S. (Plates III., IV., V., & VI.) 13 



III. A List of Species of the Genus Planaxis, with Descriptions of 

 eleven new Species. By Edgar A. Smith, Zoological Department, 

 British Museum ; 37 



IV. Description of a new Species of Porzana from the Himalayas. 



By Arthur, Viscount Walden, P.Z.S 47 



V. Contributions to the Study of the Entomostraca. By George 

 Stewardson Brady, C.M.Z.S,, and David Robertson, F.G.S. 

 No. VI. On the Distribution of the British Ostracoda. (Plates I. 



& II.) 48 



VI. The American Sponf/ilJa a Craspedote Flagellate Infusorian. 

 By H. James-Clark, A.B., B.S., Prof. Nat. Hist. Kentucky Univer- 

 sity, Lexington, Ky. (Plate XI.) 71 



VII. Additional Information on the Structure of Tethya dacty- 

 hidea, Cart. By H. J. Carter, F.R.S. &c. (Plate X. figs. 1-5.). . 82 



VIII. Fossil Coral allied to Merulina (Ehrenb.), from the Upper 

 Greensand of Haldon Hill, near Exeter. By W. Vicary, F.G.S, 

 (Plate X. fig. 0.) 84 



IX. Descriptions of some Ceylonese Reptiles and Batrachians. 



By Dr. Albert Gunther, F.R.S 85 



X. Notes on Arctocephnlus Hookeri, Gray. By Dr. H. BuR- 

 meister 89 



XL On the Distribution of Marine Animals on the Southern Coast 

 of New England. By A. E. Verrill 92 



On the Systematic Position of the King Crabs and Trilobites, by 

 M. E. van Beneden ; Cells in Crystalline Form, by Hermann 

 Karsten ; Anatomico-zoological Remarks upon Oncidhon celti- 



