252 THE TANGANYIKA PROBLEM. 
floor, between the folds of which the curiously rectangular 
orifice of a single bile duct opens. Besides this stomachic 
chamber there is an anterior diverticulum into which the 
large stomach opens by a tubular aperture, through which 
a bristle may be passed, and in this anterior stomachic 
chamber there lies an almost spherical crystalline style. 
Fig- 35- — The animal Nassopsis nassa from the dorsal 
aspect. The mantle has been cut open from above, 
and the radular sac exposed. 
The intestine passes out of the stomach beneath the tubular 
aperture between the posterior and anterior stomachic 
chambers, as indicated in the drawing on page 251. The 
intestine is coiled in the manner seen on page 251, and 
towards its rectal extremity it contains a number of 
glandular folds and striae. 
The liver is large, and occupies the lower two-thirds of 
