208 PECTINIBRANCHIATA.—TROCHIDA. 
lated Top (Trochus granulatus). It is esteemed a 
local and rather rare shell, being confined to our 
southern shores and the Irish Sea. I find it 
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“Tay i 
GRANULATED TROCHUS. 
quite common in Weymouth Bay, in from eight 
to twenty fathoms. It not unusually attains a 
height and a breadth of an inch and a quarter, 
and has been taken of an inch and a half. Its 
shape is elegantly conical, with the base rounded ; 
the whorls scarcely break the regularity of the 
outline ; they are sculptured with spiral raised lines, 
each of which is composed of a number of minute 
rounded knobs, like a string of beads. The texture 
of the shell is thin and rather fragile; its ordinary 
tint is a pale flesh-colour, or yellowish white, with 
a few scattered dashes or short streaks of purple, 
that run parallel with the spiral lines. 
The animal is large and handsome, with the 
lobes and wing-like appendages much developed. 
It is white, speckled with brown, especially about 
the head. 
