MOLLUSCA OF INDIA. Bl 
whitish, spotted with brown, which, appearing through the trans- 
lucent shell, gives the species a beautiful appearance when newly 
captured. At first sight it appeared as if the colours resided in the 
shell.” 
Specimen figured ex. coll. W. T. Blanford, from Calcutta. 
Major diam. 8-0, alt. axis 5°5 mm. 
The largest specimen I have seen in same collection, from Tal- 
chir, measures—major diam. 8°5, alt. axis 7-0 mm., showing how 
these local races or varieties differ. On a close examination of four 
Calcutta specimens, seven distinct spiral ribs, crossed by fine 
transverse oblique costulation, were counted, the ribs being less 
distinct on the last whorl. In the two specimens from Talchir 
this spiral sulcation is much wider apart, and only five could be 
counted on each whorl. 
Stoliczka (1. c. p. 239) thus describes S. infula in detail; and I 
have copied the animal with its anatomy, and that of S. attegia 
given on plate xviil., which illustrates his paper :— 
“* The animal of this species [ Pl. VIII. fig. 1 ¢] is identical in form 
and coloration with that of attegia, except that there is often a 
little more leaden grey on the upper posterior part of the foot, 
tinging the sole. The general organization is also the same in both, 
with the only difference that in the genital organs the amatorial 
sacis entirely absent. The end of the seminal receptacle is attached 
by a fine thread to the anterior part of the prostata, and the albu- 
minous gland of the uterus is comparatively larger than in attegia. 
In specimens which I examined in winter, the oviduct was ante- 
riorly only slightly enlarged ; but all the larger specimens examined 
during the rainy season showed a very conspicuous orange-coloured 
swelling in that place [ Pl. VIII. fig. 1g]. The ova composing it were 
in an advanced state of development, and some of them showed 
already a spiral arrangement of dark corpuscles. 
“The jaw (fig. 1d] exhibits a rather distinct but very fine concen- 
tric striation ; the median projection in the anterior concavity is very 
slight, and the convex edge is partially soft, granular, not entirely 
horny. 
«The radula [fig. le] is large, composed of about 100 nearly 
straight transverse rows, each generally consisting of from 307 to 
321 teeth, the seven median teeth being conspicuously larger than 
those following on either side, the formula being 
150+3.1.3+4150 
153.1. 153 
and the total number of teeth is somewhat above 30,000. 
‘«‘ The anatomy of the present species [ fig. 1f ], when compared with 
that of the last (wttegia), agrees, as already stated, almost perfectly. 
There is aslight difference in the terminal attachment of the 
seminal receptacle and in the number of enlarged teeth, but the 
only essential distinction lies in the absence of an amatorial sac in 
infula. I was at first inclined to attribute the absence of that 
