VOLUTA. VOLUTE. 253 



10. Voluta triplicate Three-folded Volute. 



Donovan, pi. 138. 



Shell strong, oval, smooth, chesnut-brown : spires six, 

 the first occupying three-fourths of the shell, the volutions 

 so very flat as to be distinguished by the separating line 

 only : aperture contracted ; pillar with three folds : length 

 hardly an inch ; breadth a third of its length. 



It resembles V. denticulata, but is stronger and more 

 opake, the volutions much flatter, and it wants the inner 

 denticles on the pillar. 



On the shores of Guernsey : rare. 



11. Voluta bidentata. Two-toothed Volute. 

 Montagu, pi. 30. f. 2. 



Shell conic, pointed, strong, thick, pure white and some- . 

 what glossy : spires six or seven, with a few distant longi- 

 tudinal wrinkles which give an undulated appearance to the 

 separating line ; the first volution extending over two-thirds 

 of the shell : aperture narrow, contracted at the upper part ; 

 the outer-lip thick ; pillar much thickened, reflected and 

 forming a slight perforation, and furnished with two tooth- 

 like folds : length a quarter of an inch ; breadth a third of 

 its length. 



In the thick outer-lip and small perforation behind the 

 pillar it resembles the V. reflexa ; but differs in color, ia 

 the flatness and number of the volutions, in being of a more 

 conic form, and in having no teeth on the outer-lip and 

 fewer on the pillar : and from V. alba it is distinguished by 

 the thick outer-lip, and the reflected pillar-lip. 



Coasts of Dunbarand Devonshire, v. m. 



12. Voluta hyalina. Transparent Volute. 

 Montagu, pi. 30. f. 1. 



Shell white, transparent, smooth, tapering tan fine point: 

 spires six, flat and hardly defined by the separating line ; 

 the larger volution covering more than half the shefl : aper- 

 ture contracted into a kind of lip or canal, and is abwj^>t!y 

 cut off at the end ; pillar with seven or eight fine thread- 

 like folds : length a quarter of an inch ; breadth more than 

 a third of its length. 



On the D unbar coast : very rare. 



z 13. Voluta 



