PLATE XII. 



This 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, 1 . almost white, and white charged with 

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

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

 with white, Sec. 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, 



