. The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . 262 THE TANGANYIKA PROBLEM. Natica lineata : they are present in tlic gills of Lit tori na,but curiously enough they are not represented in Hallersfigure of the gill of Sigaretiis ncritoides (Lam.). The osphradium is lodged in a groove beneath the gill ;it is simple, and slightly but distinctly tending to becomepectinated. At the outer extremity it is curiously bentdownwards and back, exactly repeating in this the conditionof the same organ in Sigaretiis iievitoides
. The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . 262 THE TANGANYIKA PROBLEM. Natica lineata : they are present in tlic gills of Lit tori na,but curiously enough they are not represented in Hallersfigure of the gill of Sigaretiis ncritoides (Lam.). The osphradium is lodged in a groove beneath the gill ;it is simple, and slightly but distinctly tending to becomepectinated. At the outer extremity it is curiously bentdownwards and back, exactly repeating in this the conditionof the same organ in Sigaretiis iievitoides and Xaticalineata as represented by H alien The nervous apparatus of S. zonata is remarkable, thewhole completely simulating in every detail that of Lamel-laria perspicna, as figured and described by Bouvier andHaller. The cerebral ganglia are united by a short but distinctcommissure, and are almost completely fused with thepleural ganglia. The right pleural ganglion gives rise to anerve cord which passes upwards and directly across theaxis of the animals body. It almost immediately expandsinto a ganglionic mass, which rep
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