264 



THE TANGANYIKA PROBLEM. 



Zonata repeats that of the male, but there is neither an 

 external groove nor pouch. 



NEOTHAUMA, SMITH. N. TANGANYICENSE. 



An examination of the animal contained in the remark- 



Fig. 46. — Nervous system of 

 Vivipara from above. 



able shell to which Smith applied the name Neothauma, 

 and some details of which I have already published in the 

 Proceedings of the Zoological Society, has established the 

 fact that Neothauma is a close ally of the genus Vivipara. 

 It diners, however, from Vivipara in several details which 

 are quite sufficient to allow the mollusc to continue to be 



