. The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . Fig. 22.—The lingual dentition of Bythoceras iridesce7is. ganyicia, to a small swelling on the floor of the (Esophagealtube * The radular dentition is extremely interesting, a singlerow of teeth being represented in Fig. 22. The outer andinner lateral teeth distinctly resemble those of the Melano-planaxoid type, which I described f in considering therelationships of the genus Tanganyicia, and are somethingsimilar to those of the Neomelanian group of thebrothers Sarac
. The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . Fig. 22.—The lingual dentition of Bythoceras iridesce7is. ganyicia, to a small swelling on the floor of the (Esophagealtube * The radular dentition is extremely interesting, a singlerow of teeth being represented in Fig. 22. The outer andinner lateral teeth distinctly resemble those of the Melano-planaxoid type, which I described f in considering therelationships of the genus Tanganyicia, and are somethingsimilar to those of the Neomelanian group of thebrothers Saracin ; \ while the admedian tooth is peculiar,owing to the presence of two small subsidiary denticles on * Compare figure of Ta)ii^anyiiia ritfofilosa (Fig. 32). t Loc. cit. + Die vnn Celel> (WieslKulcn, C \V. Ncrhig),189S. 240 THE TANGANYIKA PROBLEM. the inner face (Fig. 22), a very peculiar feature, and onewhich is only exemplified in the radula of Tyuipanoto)) presence of this peculiarity, together with the general. Fig. 23.—The nervous system of Bythoceras irides-cens, seen from above, f.^:, Cerebral int. g., Subintestinal ganglion. character of the radula, should certainly be regarded as ofweight in diagnosing the nearer affinities of this form. And, as we shall see in placing it along with Tyiupano- J, 1 ^ ?
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