130 LAND AND ERESH-WATER HOLLUSKS. 
band in the last whorl, as in H . rvfescens. The 
present species differs from the Rufous Snail in 
its smaller shell and in its more rounded and 
compact whorls, though equally numerous. 
These three species are found together. 
II. concinna has as wide a range as H . hispida , 
but is less frequent; in Ireland I have found the 
former in more exposed situations, about rocks 
upon the hill-slopes, than in which H . hispida is 
usually met with. 
The number of teeth on the lingual ribbon 
approaches to that of H. caperata; there are a 
hundred transverse rows of fifty-one teeth. 
Helix sericea — [the Silky Snail) (PI. VIII., 
fig. 65)—so called from the long and very fine 
white downy hairs which thickly cover the shell; 
when these are worn off, the surface presents a 
minutely granulated appearance; from which 
latter character Mr. Alder gave it the name of 
H. granulata . 
The shell is conical, more globose than that 
of any of its allies, and is less than a quarter of 
an inch in diameter and as much high; thin, of 
a greyish-white; whorls very convex, six in 
number; the umbilical aperture is extremely 
small, which alone is sufficient to distinguish it 
from its congeners or any of their varieties. 
This species is rare and local; in England it is 
chiefly confined to the South and West; it occurs 
