PLATE XII. 



"tills elegent species is found on several of the shores of Great Bri- 

 tain and Ireland, particularly those of Cornwall, Dorset, and Nor- 

 thumberland. It is generally about two inches and an half in length. 

 Shell thin and rather convex. The inside is smooth and glossy, and 

 commonly white, though sometimes of a brownish colour. The 

 colours of the outside very various and beautiful. Da Costa enume- 

 rates the chief varieties, as, ] . almost zvhitey and white charged with 

 brown, red, or purple ; 2. uniform bright yellow, and pale yellow^ 

 with white ; 3. uniform brozon, and brown, red, or purplish grounds 

 with white, &c. all these colours are elegantly blended and variegated, 

 sometimes marbled or mottled or disposed in zones, girdles, broad 

 longitudinal rays, &:c. 



Fig. 1 . represents a fine coloured specimen of the variegated red , 

 and white kind. Fig. 2. The uniform deep orange, which we appre- 

 hend is less common. 



