THE TANGANYIKA PROBLEM. 
245 
exactly as they are in Ty phobia, the operculum even 
showing once more the typical peculiarities of Ty phobia 
(compare figure on p. 222). The buccal mass and the 
salivary glands, the anterior ganglia and the nerves all 
present the same disposition and appearance as in Typhobia. 
The teeth (Fig. 26) on the radula, however, are not like 
those of any of the preceding forms, the elements forming a 
new type of dentition which we shall meet with again in 
several other halolimnic forms closely allied to Paramelania. 
In the remainder of its visceral anatomy, in the character of 
Fig. 27. — Shell of Paramelania damoni (-f ^). 
the intestine, in the possession of an anterior stomachic 
chamber and a crystalline style, Paramelania is in all 
respects similar to Typhobia, but like Limnotrochus and 
Chytra it does not appear to be viviparous. 
P. CRASSIGRANULATA, SMITH. 
This form is in all respects closely similar in the 
structure of its soft parts, shell, operculum and radula, to 
P. damoni. (See Figs. 25 and 26.) 
