230 



THE TANGANYIKA PROBLEM. 



kirkii by Miss Digby has fully confirmed the necessity 

 for such a change, as the following account of her results 

 will show. 



The shell of Chytra kirkii (Fig. 11) is remarkably 

 solid, closely resembling both that of Solarium and 

 Xenophora. 



The animal is superficially like that of Typhobia, but is 



Fig. 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 Xenophora. The 

 teeth on the tongue are highly peculiar and closely resemble 

 those of Capulus, even in minor details. The tentacles 

 are long and slender, and the eyes sessile upon their 

 outer bases. The snout is not long, and like that of 



