84 
LAND AND ERESH-WATER M0LLUSKS. 
Bay, in the county of Kerry, and stretches nearly 
north and south five miles. The lake narrows at 
its centre, where huge cliffs, principally of the 
Old Red sandstone formation, rise precipitously 
from the margin on either side. On the east side 
are those of Oulough. The broad surfaces of the 
rocks are beautifully pictured with a map-like 
coating of Lecidce and Lecanorce , and on those 
rocks, within a limited circuit, and at a distance 
of about 50 yards from the water, the Geomalaci , 
on a misty or showery day, may be noticed quies¬ 
cently stretched, their richly maculated character 
being strikingly conspicuous. On the opposite 
side is the romantic little glen of Limnavar, and 
on similar rocks, at the same range from the 
water, Geomalacus is again met with, particularly 
the white variety, but more sparingly than at 
Oulough. On no other rocks around the lake or 
the country are they to be observed.^ 
It is peculiar to the locality given. An allied 
species occurs in Portugal. 
Genus Testacella. 
The above generic appellation is derived from 
the diminutive of Testa , a shell or covering. The 
distinctive characters of the genus have already 
been given at p. 69. 
Testacella haliotidea — (the Ear-shaped Testa- 
