^ 201 



the back, the middle one frequently very faintl) marked; 

 outer lip and under part white. Length five-eighihs of 

 an inch. 



This fpecies, which is not uncommon on many of our 

 fhores, has generally been confidered as a variety of the 

 Pediculus of Linn-«us ; a (hell very common in the Weft 

 Indian feas ; but we cannot help expreffing fome doubts 

 refpetting this matter. 



We believe this is never found to pofTefs that fulcus 

 along the back, fo invariable in the foreign ones : the 

 colour of that fhell too is different, and the fpots are gene- 

 rally fix, three on each fide the dorfal depreffion. 



Thofe, who have defcribed this fulcus as a charattcr ia 

 the BritifJi fpecimens, have certainly confounded them 

 with foreign (hells ; for in the thoufands we have examined 

 from various parts of our coaft; no fuch circumftance has 

 ever occurred. The finefl; coloured, and largeft, ofthefe- 

 fhells, we ever faw, were dredged up alive in Salcomb bay ; 

 thofe frequently found dead on the fhores have generally 

 loll their purple colour, or only faintly tinged. 



2. 



Cypi'iea arcticai Pult. Cat. Dorfel. p. 39. Arctica. 



Martini. Conch i. t 29. f. 309, 

 Lift. Conch. t.707.f. bl .—Id.Angl. t.3. f. 17. 

 BorlafcCornw. t 28.f. 13 — Giialt. 1. 14 O.P. 



Cypraea Pediculus. Br. Zool. t. 70. f. 82. 



D d C. with 



