28 Journal of the Asiatic Society of Bengal. [N.S., XVI, 
October and possibly the difference is due to the two series 
having oa collected at different seasons. 
ried material we examined we were unable to find 
any trace of the horny jaw, but Mr. Clapp’s description of it is 
confirmed by an examination of the same region in our new 
species. The jaw is evidently very like that of Planorbis, con- 
sisting of a slender transverse centre-piece and two still more 
slender lateral pieces. 
As to the radula, Mr. Walker states that the central tooth 
is bicuspid and that the bases of all the teeth are quadrate. 
is tricuspid, in the other quadricuspid, the two middle cusps 
being much the longest. In this tooth, therefore, it is possible 
that the apparent discrepancies between the two descriptions 
are due merely to individual variation. This is not so, how- 
ever, with the form of the base of the laterals and marginals. 
re-examination of our preparations and a comparison with 
8 
aquatic pulmonates are always difficult to examine in detail, 
sont Mr. Walker’s figures can only be described as somewhat 
crude. 
We do not think that there can be any doubt that the 
American malacologist and we ourselves were dealing with the 
same species. To prevent any misconception as to the ap- 
pearance of rivalry due to the practically simultaneous publi- 
cation of our papers on the subject, we wish to state that we 
had invited Mr Walker to publish his description oi and that 
he had agreed to do so in a most courteous mann 
Camptoceras subspinosum sp. nov. 
This species (fig. 1) is, as we have said, closely allied 
to ne ieereten:, Blanford,! but differs in the following charac- 
ter 
q) The shell is considerably Api and more elongate 
and has 4 instead of 24 w 
(2) Its whorl are more convex a oe oblique and the 
uture is less well defined, not so deep and broader. 
(3) The mouth of the shell is longer in proportion to its 
readth and narrower abov 
(4) The sculpture consists of mee lines of minute sub- 
1 See Blanford, Journ. As. Soc. Bengal XL, p. 40, pl. ii, fig. 3 (1871 
The description is reprinted in Gude’s volume on the ‘Mottusee’ (it) sa th the ; 
Faun. Brit. Ind., p. 464, fig. 144 (1914). 
