30 Records of the Indian Museum. MVOL, X<VirE «- 
tween the groups Plotia and M elanoides, but comes in the latter 
rather than the former. , 
The genus Melanoides may be defined thus :—Melaniidae in 
ig 
| eae 
Fic. 4.—Radular teeth of Melaniidae (x 125). 
A. Teeth of Melanoides tigrina (Hutton) from Quetta. 
B. Upper part of teeth of M. pyramis var. luteomarginata (Nevill) from 
Persian Baluchistan. 
C. Upper part of teeth of M. pyramis var. leopardina, var. nov. from 
Poona. 
D. Upper part of teeth of M. pyramis var. flavida (Nevill) from spring 
in Afghan-Baluch desert. 
E. Teeth of Melanopsis deserticola, sp. nov. from spring in Persian 
Baluchistan. 
which the shell is small or of moderate size, tapering or turreted 
and never of very great thickness or relative breadth. The mouth 
is small, ovoid and not greatly produced in front ; the columellar 
