82 Records of the Indian Museum. [Vov,. VII, 1912.] 
commissures and of most of the ganglia. But in the present species 
there is a distinct infra-intestinal (sub-intestinal) ganglion con- 
stantly present. Moreover, the presence of one or more accessory 
infra-intestinal ganglia has been observed in a large number of 
specimens. 
LITERATURE. 
1. Bouvier, E. Ll. ‘‘ Systéme nerveux, morphologie générale 
et classification des Gastéropodes Prosobranches,’’ Amn. 
Sez. Nat. (Zool.) (7), 11, 1887. 
2. Lloyd, R. E. Am introduction to biology for students in 
India. 
3. Pelseneer, P. Article ‘‘ Mollusca’ 
edited by Sir EF. R. Lankester. 
b 
in Text-book of Zoology 
