96 CYCLOSTOMATIDA. 
leaves in all parts of the British Isles south of the — 
Moray Firth. 
Family V.—CYCLOSTOMATID&. 
Genus I—CyYcLOsTOMA. 
C. ELEGANS (elegant). 
Globosely oval, solid, opaque, light pink, marked with 
streaks or spots of a darker colour; very strongly striated 
in the line of growth, and more closely striated spirally ; 
whorls four and a half, cylindrical ; suture very deep; spire 
blunt; mouth nearly circular ; wmbilicus small, but deep ; 
operculum thick, testaceous. 
This interesting shell is the only British representa- 
tive of an interesting genus which abounds in species 
in warmer latitudes. 
It is common in England, Wales, and Ireland, 
mostly—though not exclusively—in calcareous soils 
near the sea. Along the banks of the Thames be- 
tween Marlow and Maidenhead it occurs in great 
abundance on the chalk hills. It is also tolerably 
plentiful in Jersey, where there are no calcareous © 
strata. 
