68 HELICIDA. 
13. H. revevAta (discovered). 
Somewhat globular; spire depressed; pale olive green, 
covered scantily with short pale hairs; whorls four to four 
and a half; swtwre deep; mouth nearly circular; wmbilicus 
small. 
This is a very local species, only found in the Channel 
Islands and on the south-west coast of England. 
14. H. rtsca (dusky brown). 
Sub-conical, so thin as to be almost membranaceous, 
glossy, pale yellowish brown, marked in the line of growth 
by strong corrugations; faintly keeled ; whorls five to five 
and a half; wmbilicus very small. 
The shell of this species is almost membranaceous, 
and has been known to have been pressed flat and 
. blown up again without suffermg any detriment. 
It does not occur everywhere, but is found near 
Belfast, in Wales, and in several parts of England. 
It frequents grassy banks, and is said to feed on 
nettles. 
15. H. Pisana (first noticed at Pisa). 
Sub-globular, solid, nearly opaque, yellowish white, 
marked with variegated bands; whorls five to five and a 
half; interior of mouth rose-colour ; wmbilicus very small. 
This species 1s unmistakable from its markings and 
shape, though it somewhat resembles a large form of 
