Austenia, 
MOLLUSCA OF INDIA. W7/ 
&e.), Which have a central convex projection on the 
frontal edge. In the great number of teeth it recalls the genus 
Durgella, which also has a straight jaw. 
The odontophore is very similar to Helicarion ceratodes, Pfr., from 
Luzon, given by Dr. C. Semper in Reis. Archipel Philippinen, pl. vi. 
fig. 24; and the animal on plate i. fig. 12 is also very like, but does 
not show the form of the right shell-lobe. 
EXPLANATION OF PLATE IV. 
Animal of Cryptosoma prestans, from nature, nat. size. Copied 
from an original drawing made by native artist, under the super- 
intendence of the late Dr. F. Stoliczka. 
. Animal (enlarged), from spirit-specimen, viewed from right side. 
Shell removed, showing the mantle and its lobes. 
. Ditto, left side. 
. Ditto, posterior side, viewed from above, showing the junction of the 
shell-lobes. 
. Ditto, side view. 
. Anterior portion, underside of foot, showing the segmented pallial 
margin. 
. Side view of extremity of foot. 
. Generative organs. 
. Ditto, second specimen. 
. Male organ, showing the cxcum or kalk-sac, 
. daw, X 20. 
. Teeth of lingual ribbon, x 360. 
12a. Laterals, about the 100th from central tooth. 
126. Outermost laterals. 
