26 Records of the Indian Museum. PWor. VILE 
lar and its internal margin concave in the same degree. The tip is 
pointed. The internal margin bears near its middle a long straight 
process terminating in a crateriform sucker-like structure, from the 
centre of which protrudes an elongate muscular papilla. The main 
body is smooth, the process obscurely annulate. Before entering 
the penis the vas deferens is highly convoluted and would be of 
immense length if unravelled. In the penis it pursues a sinuous 
course near the concave margin and remains distinct nearly to the 
aperture at the tip of the organ. The outer part of the penis 
appears to be glandular internally, but is provided with a well- 
developed layer of transverse muscle fibres externally. 
The living animal was thus described in the field :—‘‘ Animal 
white with black clouding and minute goiden yellow specks on the 
mantle; a suffusion of black pigment on the snout and tentacles. 
Tentacles slender, when fully expanded no longer than shell. Eyes 
small, black, prominent, situated near the base of the tentacles 
Fic. 2.—Male intromittent organ of Amnicola (Alocinma) sistanica, sp. nov. 
( X 20), seen from below. 
a.p.=accessory appendage: g.=glandular region: v.d.=vas deferens. 
externally. Snout rather long and narrow, with parallel sides, 
slightly notched in front. Foot relatively small, rounded in front 
and bluntly angulate at the anterior corners, bluntly pointed 
behind.” 
Type-spectmens. M 11538/2, Zoological Survey of India (Ind. 
Mus.). 
Distribution. All over the dry Nazzar or reed-country of nor- 
thern Seistan shells of this species are common in the soil, as they 
are also in the debris of floods. We found fresh shells in the 
larger pools in the reed-beds of the Hamun near Lab-i-Baring and 
a few living individuals among the algae on the roots of Phragmites 
in narrow channels in the same beds.. . 
These living individuals, which were very scarce, were all 
small and were only found in. protected situations. Very large 
numbers of the mollusc evidently perish annually with the sinking 
of the floods and the majority of those that survive probably bur- 
row into the mud and hibernate in winter. 
