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Show 170 MR. CYRIL CROSSLAND ON THE [Mar. 7, The following is the measurement of a female:- Length. Weight, inches. lbs. 431 36 4 teats. naonal. A s tar as is known at present the range of this Antelope is extremely limited. It is found on the upper water of the Tana River, about 50 miles due south of Mount Kenya and about 5 miles south-east of Fort Hall, where it is very plentiful. It extends only about 10 miles down the Tana River, and is not found further from the river than the Ithanga Hills and their immediate neighbourhood. 3. The (Ecology and Deposits of the Cape Verde Marine Fauna. By C y r i l C r o s s l a n d , M .A ., B.Sc., F .Z .S ., Carnegie Fellow and Fellow of the University of St. Andrews. [Received January 13, 1905.] (Text-figures 21-26.) C o n ten ts. 1. Introduction ........................................................................... 2. Narrative and Results ........................................................ 3. Comparison of the Fauna with that of East Africa 4. The Organic Deposits ....................................................... 5. The St. Vincent Fringing-Reef .................................... 6. Summary and Conclusions .............................................. 1. I n tr o d u c t io n . An examination of the Collections made by me for Sir Charles Eliot, K.C.M.G., in Zanzibar and East Africa in 1900-1902 showed at once that the whole Indo-Pacific Ocean from Africa to the Pacific Archipelagoes is one faunistic area. The region, however, is not so well known as to admit of definite subdivision; in East Africa, e. <7., we cannot say whether the numerous new species discovered are characteristic of the region or merely of the special habitats which we examined. The wide distribution of many of the Opisthobranch Molluscs is so striking as to have led Sir Charles Eliot to suggest an expedition to the Tropical Atlantic, with the object of discovering whether there is any relationship between the faunas of these so widely separated oceans. As several species of Polychagta also appear to range from the Indo-Pacific to the Mediterranean and even Caribbean Seas, the idea was highly attractive to me. I am convinced, too, that the special difficulties of systematic work on the Polyclueta can be satisfactorily attacked only by the Page 170 172 176 178 182 185 Height at shoulder, inches. 25 i |