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 the gills of Littorina,but curiously enough they are not represented in Hallersfigure of the gill of Sigaretus neritoides (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 Sigaretus neritoides and Nati
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 the gills of Littorina,but curiously enough they are not represented in Hallersfigure of the gill of Sigaretus neritoides (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 Sigaretus neritoides and Naticalineata as represented by Haller. The nervous apparatus of >S. sonata is remarkable, thewhole completely simulating in every detail that of Lamel-laria perspiciia, 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 repr
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