THE TANGANYIKA PROBLEM. 
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and interesting, being divided into an anterior and a 
posterior chamber. The oesophagus enters on the left 
almost at the constriction which separates these two 
stomachic chambers, the intestine leaving from the same 
region below. The posterior chamber of the stomach con- 
tains a large valvular fold, and the bile-duct opens into it 
from beneath. The walls of the posterior stomachic cham- 
ber, like those of most gastropods, are thin, but beyond the 
Fig. 6. — Section of one of the otocysts of 
Typhobia horei ( X 206). 
constriction which separates the two stomachic chambers 
one from another, the walls of the anterior chamber are 
found to be very thick, and the chamber itself contains 
a long, clear, transparent body, loose in the cavity, the 
so-called crystalline style. The kidney is situated be- 
hind and around the heart, and the digestive gland 
occupies the greater part of the space in the upper coils 
of the body. The heart consists of an auricle receiving 
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