CLAUSILIA. 89 
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All the members of this genus are sinistral. 
1. C. nuGésa (wrinkled). 
Fusiform, purplish brown, but varying in colour; marked 
with small streaks of white; closely and irregularly striated 
in the line of growth; whorls ten to thirteen ; spire tapering 
to a blunt point; mouth pear-shaped, expanding like a 
funnel, angulated above; plications two on the pillar, with 
two or three ribs between them, a plication behind the 
pillar lip, near which is a spiral fold; one or two teeth 
inside the outer lip; wmbilicus narrow; clausiliwm shaped 
much like a “shoehorn.” 
This common shell is distributed throughout the 
whole of the British Isles, and is usually found on 
stone walls, rocks, rough bark of trees, and sometimes 
on sand-hills. It is very variable both in colour and 
markings. The smaller forms seem to be found, as 
might be expected, in northern and exposed situa- 
tions. I have found it abundantly on the banks of 
the River Bann, adhering to stones which are com- 
pletely covered at high tides. 
Var. I. albida. Whitish. 
Var. II. Everetti. Smaller. 
Var. III. gracilior. More slender. 
Var. LV. tumidula. Shorter, more ventricose. 
Var. V. dubia. Larger, more ventricose. 
Var. VI. Schlecht. “Generally larger, more 
