. The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . Iig- 13-—The nervous system of Aporrhais pes pelicani exposed from above for com-parison with that of Chytra, p. 232. modified in accordance with the peculiar shape of the shell,in the same manner as the animal of XenopJiora. Theteeth on the tongue are highly peculiar and closely resemblethose of Capultis, even in minor details. The tentaclesare long and slender, and the eyes sessile upon theirouter bases. The snout is not long, and like that of THE TANGANYIKA PROBLE
. The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . Iig- 13-—The nervous system of Aporrhais pes pelicani exposed from above for com-parison with that of Chytra, p. 232. modified in accordance with the peculiar shape of the shell,in the same manner as the animal of XenopJiora. Theteeth on the tongue are highly peculiar and closely resemblethose of Capultis, even in minor details. The tentaclesare long and slender, and the eyes sessile upon theirouter bases. The snout is not long, and like that of THE TANGANYIKA PROBLEM. 231 Aporrhais. In fact, the whole of the visceral anatomyof Chytra closely resembles that of Aporrhais and itsallies. The buccal mass is small and the radular sac a mereexpansion of the alimentary tube. The nervous systemclosely resembles that of both Aporrhais and cerebral ganglia are closely approximated together,and the pleural ganglia are closely applied to them. Thesupra-intestinal cord is long, the left pleural being unitedby a long cord to the left pallial nerve as in Fig. 15. The. Fig. 14.—A single row of the lingual teeth of Chytra kirkii (X 150). sub-intestinal cord is shorter and the sub-intestinal oanolion o o is directly connected with the right pleural ganglion by along zygoneurous connection; the right pallial nerve arisingindependently from the right sub - intestinal from the side, the cerebro-pedal and pleuro-pedalcords are short, like those of Capidtts. The oesophagus is nearly straight and leads into thestomach, which is divided into two chambers, the anteriorchamber containing a crystalline style. On the floor of theposterior chamber there is a conspicuous longitudinal 232 THE TANGANYIKA valvular fold which becomes doubled near the aperture ofa bile duct, and then passes, as in Tvochus, into a small, butquite well developed, spiral caicum. Except for the presenceof the anterior chamber, which appears to be absent
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