72 HELICID^E. 



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. 



Yar. II. pyramidalis. Spire much produced. 



Var. III. Turtoni. Spire very depressed. 



Var. IV. alba. Cream-coloured or pale green, 



20. H. RUPESTRIS (inhabiting rocks) ~ 



Sub-conical, rather solid, semi-transparent, rather glossy, 

 ctark horn-colour; closely and regularly striated in the 

 line of growth; obtusely carinated, especially when young; 

 spire raised ; suture very deep ; mouth gibbous ; umbilicus 

 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. PYGMiiA (minute). 

 Circular, depressed, thin, semi-transparent, glossy. 



