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*
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