370 Mr. Broderip and Mr. G. B. Sowerby on some 



From Pitcairn's Island, between the chasms formed by the coral rocks 

 in a cavern, in about one foot water. Many specimens were brought, 

 from some of the Sandwich Islands by Captain Cook in the Endeavour : 

 they were all of a dark green colour, and pierced, having been strung 

 by the natives. 



Crepidula incurvata. 



C. testa ovatd, vertice incurvo, marginali ; lamina interna arcuatd, 

 incurvd; long. lyL, lat. y^, poll. 

 Hab. in Oceano Boreali, ad littora Kamtchatkse. 



A thick, rough epidermis coats the outside of this singular Crepidula, 



FiSSURELLA HIANS. 



F. testa ovali, convexd, cinered, sub-radiatd, intiis albidd, margine sub- 

 purpurascente, pellucido ; for amine magno, ovali, hiante ; long. 

 4^%, lat. 3, alt. 1-j^^'^, poll. 

 Hob. ad littora Oceani Pacifici. 



This fine species of Fissurella came from the neighbourhood of Val- 

 paraiso, 



*Emarginula crenulata, 



E. testa ovatd, postice longiore, margine crenulato, siphone laterali ; 

 long. ■^%, lat. ^V, poll. 



Hab. 



We have seen only one specimen, which is remarkable for the groove 

 formed to conduct the siphon, being placed on one side of the head, 



LiTTORINA SQUALIDA. 



L. testa obovali, apice acuminata ; anfractibus superne depressiusculis ; 

 aperturd rotundd, labio superne coarctato ; long. 1, lat. y^j P^/^. 



Hab. in Oceano Boreali. 



Shell very much hke the common Periwinkle ; but not so thick and 

 heavy : it is further distinguished by the contraction of the upper part 

 of the hp. 



