4. Further Notes on the Genus Camptoceras 
(Mollusca Pulmonata), 
By N. AnnanDaLe, D.Sc., F.A.S.B., and Barnt PRASHAD, 
DSc. (Zoological Survey of India). 
Since we submitted to this Society last year our notes on 
the genus Camptoceras, Benson, two events have occurred that 
We are thus placed in a better position to estimate the exact 
status and relationships of the genus. Before discussing these 
points we will give a few notes on the two species C. hiraset, 
Walker, and C. subspinosum, sp. nov. 
Camptoceras hirasei, Walker. 
1919. Camptoceras hirasei, Walker, Occ. Papers Mus. 
Zool. iv. Michigan, No. 64, pp. 1-6, pl. 1 
(March 17th). 
1919. Camptoceras sp , Annandale & Prashad, Journ. As. 
Soc. Bengal (n.s.) XIV, p. 458, pl. xii, fig. 2. 
Walker discusses not only the shell of his new species but 
also the external anatomy, the radula and certain of the 
internal organs. His material was, however, defective, and he 
of the shell and radula do not altogether conform with our 
own and we are not able to accept his description of the radula 
as accurate. 
So far as the shell is concerned we believe that the dis- 
crepancies are probably due to the fact that his specimens 
were not so mature as ours. It is true that they were slight- 
ly larger than those we examined, but considerable varia- 
those of the specimen figured by us. In our specimen there 
was a vertical ridge or varix on the outer aspect of the body- 
whorl that seemed to indicate that the animal had under- 
gone at least one period of arrested growth. No such ridge is 
shown in Mr. Walker’s figures. Our specimen was killed in 
