1920. ] Further Notes on the Genus Camptoceras. 29 
spinose tubercles ! with very fine longitudinal and 
transverse striae between them. 
So far as ged veag when are concerned this species pro- 
vides a link not only between C. lineatum and C. hiraset but 
also between aye genus as a cadaie and the Malayan and 
Australian species of Bullinus. 
Fie. 1.—Type specimen of Camptoceras subspinosum, sp. nov. 
The radula (fig. 2) is very similar to that of C. hiraset, but 
the teeth are distinctly longer and the central differs in having 
pes cusps. In one radula the cusps of this tooth are dis- 
, two in number, while in another they are fuss together 
bUddA i A 
Fic. 2.—Radular teeth of Camptoceras subspinosum sp. Nov. 
a=central ; b, b=laterals ; c=marginals. 
so that the tooth is really unicuspid. In our preparations of 
this species it is clear se the extremity of the cusps of all 
the teeth is produced into a sharp spine-like process as in 
Planorbis and allied sedi but this process is extrem ow 
1 This character is better seen in specimens in spirit than in oe 
shells and may not be differe ntial. 
