38 Records of the Indian Museum. [Vor XVII, 
of which there are at least eight in complete shells, increase very 
gradually and regularly and are not at all swollen. The suture is 
not impressed but is, at any rate above the body-whorl, slightly 
undercut downwards. It is a little oblique. The spire is rela- 
tively long, nearly as long as the body-whorl in ventral and longer 
than that whorl in dorsal view. It is sharply pointed in the com- 
plete shell. The body-whorl is relatively narrow, much longer than 
broad and almost oblong in ventral view. In dorsal view the 
outer profile is in a straight line with that of the spire for about 
a third of its length and then curves abruptly inwards. The outer 
anterior angle is pointed and slightly produced. The mouth is 
rather small and relatively broad, slightly oblique and distinctly 
constricted posteriorly. ‘The outer lip, which is not thickened, is 
sinuate and convex in its anterior part. The columella projects 
slightly ; it is bent and its callus is moderate. The posterior 
canal of the mouth is short, narrow and straight. The surface 
of the shell is sculptured with coarse longitudinal striae, some 
of which on the body-whorl are irregularly thickened. In very 
old individuals these may have the appearance of obsolete ribs. 
The colour is normally a dull purplish black with the upper 
part of each whorl and the base of the body-whorl slightly paler ; 
but some shells are bleached. 
Measurements of Shells (in millimetres). 
Type-sp. 
Length se week Aedes Tea) me Beces 
Breadth Stay AOS) 40 Te oe 
Length of aperture a, 86 iroy uae (66 
Breadth of aperture iG ge 6 AOE ER SES) 
Length of spine (dorsal) =.) . 7.31) OOo 
The operculum is thick and has the nuclear region small and 
obscurely spiral. 
The animal is much shrunk in the specimens examined, but 
some interesting features of its external anatomy are apparent. 
The snout is relatively short and broad and slightly notched in 
front. The foot is much longer that broad. The tentacles, in a 
contracted condition, are very short, tapering and not very thick. 
They bear a relatively large oculiferous lobe at their outer base. 
The eye is also large. ‘The upper surface of the exposed parts is 
blackish with white transverse lines, the sole white. 
The radular teeth are large al rather stout. The central 
tooth is much broader than high. It is produced into blunt angles 
at the base on either side. Its upper margin bears three low prom- 
inences, while the lower margin is concave. There are five cusps, 
of which the central cusp is more than twice as long as the others ; 
all are bluntly pointed and directed downwards. The disk bears a 
very large trilobed process with the central lobe broad and trun- 
cate, the lateral lobes pointed and with sinuate inner margins. The 
