915 JOURNAL, BOMBAY NATURAL HISTORY SOCIETY, Vol. VIII. 
the canal is not very obvious, there is a deep sinus or cut into the base 
of the shell. 
Division I. 
In Division I. we have really only one common shell, the limpet 
(Patella aster, Reeve), but a so-called key-hole limpet, with a small 
hole at the apex of the shell (Fissurella lima, Sow.), is also to be found, 
and under muddy stones there lives a little animal with a shield-shaped 
shell (Scutum unguzs, Linn.) 
Division II. 
TROCHIDA. 
There are a great many members of this family, several very common, 
and they are best known by the nacreous (M. O. P.) construction of 
their shells, which may generally be seen by an examination of the 
mouth or by removing the outer or coloured layer of the shell. 
Turbo elegans (Phil.).—A_ large shell having four to five whorls ; 
whorls rounded and ridged spirally ; brown with green and yellow 
shadings and mottlings ; mouth circular ; length, which I shall always 
take as from apex to base, about 2 inches ; breadth at the widest part 
of the last whorl, 14 inches. 
The next three are all pyramidal in shape, the whorls being out- 
wardly flattish. 
Trochus radiatus (Gmelin) and Clanculus depictus (A. Ad.).—Both 
very common, especially the former ; both are beaded, the beadings 
forming spiral bands running round the shell. TZ. radzatus is much the 
larger and easily recognised by the broad, red or maroon, irregular 
stripes running down the shell. Between the stripes the colour is 
greenish when alive, turning to yellow or whitish when dead. C. 
depictus is yellow or grey, with similar but black stripes. I have found 
some specimens a light yellow-grey colour, with no stripes. Others 
uniformly dark grey, but black stripes are the rule. 
Astralium stellatum (Gmelin).— Whorls sharply noduled at intervals 
at the lower margin and diagonally striated ; colour, a dull yellow. 
Huchelus indicus (A, Ad.).—A dull brown, smallish shell, very com- 
mon ; whorls rounded with minute beadings, forming fine spiral lines ; 
mouth circular. 
