p. with a fub-pellucid, conic (hell, of a brown colour 

 when alive, flrongly, and elegantly cancellated: vertex 

 a little reflecled : diflinguinied by a longitudinal filTure, 

 or flit at the anterior end, from the margin upwards, 

 about one fourth the length of the (hell : Infide fmooth, 

 gloflfy, fleili-coloured : margin oval, crenated. Length 

 half an inch ; breadth three eighths; height the {lime. 



In young fnells the vertex is much more reflexed, and 

 fometimes flightly hooked, turning backwards almofl per- 

 pendicular to the pofterior margin. Worn fhells become 

 white, or pale flefli-colour, and lofe their crenated edge. 



This appears to be a local fpecies, and feems to be 

 chiefly confined to the weffern coafls. Doclor Pulte- 

 NEY mentions it on the fhores o\ Dor fet fair e ; and Da 

 Costa on thofe o{ Cornwall and DevonJJiire, particularly 

 at Birnflable ; but had probably never feen a live, or 

 recent fpecimen, as he defcribes it to be white. 



We have found it fparingly on fome parts of the Corn- 

 ijli coafl; and more plentiful on that qK South Devon, 

 obtaining the moff perfeft fpecimens by dredging in Sal- 

 comb bay, adhering to ffones. and old oyfler and other 

 fhells; but not comiiion, or of a large fize. Have alfo 

 received fmall ones from Stindwich in Kent.. 



^* 12. 



'Patella Fiflfurella. Gmel Syji. p. 372S. 193? Afertura. 



Tun. Lin iv. p. 592 ? Tab. 13. f, iG. 



R r r 2 P. with 



