41 



Helix virgata. Montagu, p. 415. t. 24. /. t. 



Teba virgata. Leach, Mollusc, p. 93. 



Helix variabilis. Drap. p. 84. t. 5.f. 11, 12. 



Helix striata. Brard, p. 36. t. 2.f. 5, 6. 



Helix zonaria. Donovan, ii. tab. 65. 



Helix Pisana. Dillwyn, p. 911 . 



Shell about half an inch in diameter, and nearly as 

 much high, usually white with a single dark brown 

 band in the middle of the larger volution, and se- 

 veral irregular ones at the base ; but subject to 

 infinite variations from the presence or absence or 

 confluence of the bands, the most singular of 

 which is that of a dark brown with a single white 

 band, and that of a pure opake white with trans- 

 parent white bands : the tip generally black : about 

 the mouth and pillar dull rufous : aperture longer 

 than broad, the margin thin and reflected at the 

 umbilicus, which is small and deep. 



When young, the larger volution slopes to a some- 

 what carinated edge. 



Perhaps the Trochus terrestris of Donovan, Plate 

 III., with a spiral brown streak round the middle 

 of the volutions, may be a conical variety of this 

 very variable species. 



In vast abundance on sandy plains, especially about 



the sea-coasts. 

 In the autumn these shells are often suddenly 



