1900.] ON THE MARINE FAUNA OF CHRISTMAS ISLAND. 115 



large white patch on the back of the lower part of the neck, and 

 a still larger white saddle on the loins, through which ran a dark 

 dorsal streak to the tail. The under-parts were scarcely lighter 

 than the back ; and the legs had no white, being cigar-brown in 

 front and golden brown behind. The horns were of great size, and 

 remarkable for their extreme depth. In the absence of white on 

 the legs and the dark under-parts, the skin was like that of 

 C. sibirica sarin, but the latter had no white nuchal patch and a very 

 indistinct lumbar saddle. The associated female skin, in which the 

 hair on the back was just changing, so that the grey pashm, or 

 under-fur, was exposed, was remarkable for the circumstance that 

 the whole of the under-parts were pure white, quite unlike what 

 the describer had seen in any other Ibex. 



Mr. Lydekker believed that Mr. Walter Eothschild had an Ibex 

 skin similar to the male exhibited which would be shortly described 

 as a new form. 



The following papers were read : — 



1. On the Marine Fauna of Christmas Island (Indian 

 Ocean). By C. W. Andrews, B.Sc, F.Z.S., Edgar A. 

 Smith, H. M. Bernard, R. Kirkpatrick, and F. C. 

 Chapman. 



[Received January 16, 1900.] 



(Plates XII. & XIII.) 



Contents. 



Page 



I. Introductory Note. By C. W. Andrews, B.Sc., F.Z.S 115 



II. A List of the Marine Mollusca collected by Mr. C. W. Andrews at 



Christmas Island. By Edgar A. Smith 117 



Til. On the Madreporaria collected by Mr. C. W. Andrews at Christmas 



Island. By H. M. Bernard 119 



IV. On the Sponges of Christmas Island. By R. Kirkpatrick 127 



V. List of the Foraminifera from the Boat-channel, Plying Pish Cove, 

 Christmas Island, 11 fathoms. By P. C. Chapman, A.L.S., 



F.R.M.S 141 



VI. Explanation of the Plates HI 



I. Introductory Note. 



The chief objects of my recent visit to Christmas Island (Indian 

 Ocean) were to collect the land fauna and flora and work out the 

 structure of the island itself, and nearly the whole of my time was 

 devoted to these ends. At the same time some small collections 

 of the marine fauna were made, and these have been determined 

 by various specialists, some of whose reports are printed below. 

 The Gephyrean worms (six species, none of which are new) have 

 already been noticed by Mr. A. B. Shipley in the Proceedings of 

 this Society (P. Z. S. 1899, p. 54). 



8* 



