The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . Fig. 21.—Bythoceras iridescens. The shell front and back (X \). forms. In the young condition the shell is extremelysimilar to that of Paramelania, and I am inclined tothink that the figure of Paramelania crassilabris, givenby Professor E. von Martens in his work, BeschalteWeichthiere, Deutsch Ost-Afrikas (PI. VI. Fig. 38), is,in reality, that of a young Bythoceras iridescens. The outward appearance of the animal is extremelysimilar to that of Cerithium vulgatum, with
The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . Fig. 21.—Bythoceras iridescens. The shell front and back (X \). forms. In the young condition the shell is extremelysimilar to that of Paramelania, and I am inclined tothink that the figure of Paramelania crassilabris, givenby Professor E. von Martens in his work, BeschalteWeichthiere, Deutsch Ost-Afrikas (PI. VI. Fig. 38), is,in reality, that of a young Bythoceras iridescens. The outward appearance of the animal is extremelysimilar to that of Cerithium vulgatum, with the exception * From 300 to 1,000 feet. THE TANGANYIKA PROBLEM. 239 that there is less pigmentation of the foot, which is nearlywhite in the Tanganyika species. The snout is short, wrinkled, richly covered with blackpigment and non-protrusible. The tentacles are short, andthe eyes are situated on the posterior cases of these organs,and not separated from them on subsidiary papillae as inNassopsis. The buccal mass is small and the radular sacshort, being reduced, as in the case of Typhobia and Tan- <€-^
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectm, booksubjectzoology
