12 HELICIDZA. 
horn-colour, marked at regular intervals by rufous brown ; 
ribbed in the line of growth; whorls six to seven, com- 
pressed above; outer margin strongly carinated ; umbilicus 
large and shallow. 
This is an extremely common shell, and is easily 
identified. It is found everywhere, under stones, logs, 
&c., and in moss. The white variety, which is a rare 
capture, is a beautiful object. 
Var. I. minor. Smaller. . 
Var. II. pyramidalis. Spire much produced. 
Var. III. Turtent. Spire very depressed. 
Var. IV. alba. Cream-coloured or pale green. 
20. H. RnupestRis (inhabiting rocks). 
Sub-conical, rather solid, semi-transparent, rather glossy, 
dark horn-colour; closely and regularly striated in the 
line of growth; obtusely carinated, especially when young; 
spire raised; suture very deep; mouth gibbous; wmbilicus 
wide and deep. 
This is a hardy little creature, and may be found on 
stone walls and limestone rocks at a considerable ele- 
vation. It is gregarious. 
Var. viridescenti-alba. Greenish white. 
21. H. pramHa (minute). 
Circular, depressed, thin, semi-transparent, glossy, 
