74 HELICIDA. 
23. H. wapicipa (stone-cutter). 
Circular, compressed, dark rufous brown, dull, semi- 
transparent ; whorls five; mouth obliquely oval, surrounded 
by a strong white reflected rim; very strongly carinated ; 
umbilicus large. 
This strikingly formed shell is found in many parts 
of England, rarely in Scotland and Wales, and not at 
all in Ireland. It occurs chiefly in calcareous districts, 
but not exclusively; it is fairly common at Maiden- 
head (Berks), where the soil is gravelly, and at other 
places. 
The name “stone-cutter” is due to its supposed 
habit of boring into rocks. This idea is, of course, 
erroneous, but it does ensconce itself in crevices of 
rocks, whence it emerges after rain. 
Var. I. albina. White. 
Var. II. minor. Smaller and darker. 
24. H. opvotuTa (wrapped up). 
Circular, flat above, compressed below, rather solid, 
opaque, reddish brown, hispid; whorls six and a half, | 
cylindrical; mouth triangular, surrounded by a strong 
pinkish white rim with three tooth-like protuberances ; 
umbilicus large. 
This peculiar shell is only found in the neighbour- 
hood of Ditcham Wood, Hants, where it is not un- 
