46 Records of the Indian Museum. hVGL. x Vinbk 
becomes comparativey short (slightly more than 4) 
of the total length, while the body-whorl being more 
transverse appears broader and has a more expanded 
mouth, the posterior extremity of which is situated 
at.a higher level on the shell. 
Measurements of Shells (in millimetres). 
Type (a).. Type (0). Young. 
Length As TGESEO 16°0 3 
Breadth : eet, II‘3 4°6 
Length of aperture IOS) TSHOL 4'8 
Breadth ot aperture _ Sipe OS 6°3 Ee, 
Length of spire (dorsal Ciem) 50 3°4 25 
Breadth of base of spire (dorsal 
view) a BRL aoa 22 2'0 
The soft parts of the tiving anima! have no noteworthy peculi- 
arity. The foot and head are pale greenish yellow with minute 
whitish specks. The lower part of the mantle is black with large 
rounded yellowish spots; higher up the yellow predominates and 
the dark pigmentation is reduced to a delicate network. 
The alimentary canal. ‘The jaw is not strongly developed ; 
the central piece is narrow and lunate, only its outer or marginal 
half is fully cornified and of a brown colour. The side pieces 
are feeble. The buccal mass is large and powerful, deeply rounded 
in lateral view. The salivary glands are smaller than in some 
species; they enter the alimentary canal just behind the buccal 
mass. 
The radula is broad, its dental formula being approximately 
8.7.1.7.18. The central tooth, which is comparatively large, 
has a distinctly tridentate cusp, which is very asymmetrical and 
is provided at the tip of the central denticulation with a minute 
thickened spine or tooth. The base of the tooth is elongate and 
only a little emarginate proximally. The lateral teeth are broad 
and tridentate; those on either side of the central tooth have the 
innermost denticulation subequal to the outermost and the central 
denticulation long and sharp. The outer lateral or intermediate 
teeth have two rather blunt cusps; the true marginals have from 
3 to at least 7 very short and blunt denticulations, the outermost 
of which is the broadest. These denticulations are arranged in 
an almost straight transverse line. 
The oesophagus is slender and elongate, marked on the sur- 
face with lines of dark pigment; it forms a well-defined double 
loop at about half its length between the buccal mass and the. 
chyle stomach. ‘This structure is short and by no means clearly 
differentiated externally. The lateral muscular masses of the 
gizzard are large but quite distinct in the middle line and slightly 
unequal in size; they extend very little over the true stomach, 
which is elongate and merges very gradually into the intestine 
