PUPA. 79 



moss, dead leaves, &c. As Dr. Jeffreys remarks, 

 " the spire varies greatly in length," some individuals 

 not being half the length of the full size, which is 

 between one-seventh and one-eighth of an inch. 



The young are carinated and have a well-marked 

 umbilicus. 



Var. I. edentula. Denticle absent. 



Yar. II. alba. White. 



4. P. MAEGINATA (margined). 



Cylindrical, rather solid, dull, brown horn-colour ; whorls 

 six to seven ; striated finely in the line of growth ; mouth 

 nearly circular, sometimes furnished with a denticle similar 

 to that of the last species. Outside there is a white rib, not 

 quite at the margin, which is thin and unreflected. 



This species is specially fond of sandy soils near the 

 sea coast, but is frequently found inland. Generally 

 distributed. 



P. marginata and P. umbilicata differ in the following 

 respects : 



P. UMBILICATA. 



Smooth and glossy. 



Ovate. 



Mouth horseshoe- 

 shaped, with a thick 

 reflected lip. 



P. MARGINATA. 



Dull, striated. 



Cylindrical. 



Mouth smaller, nearly 

 circular, lip not re- 

 flected, but thickened. 



