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 ineurvo, marginali ; lamind interna arcuatd, 

 incurvd; long, lyV, ^«<. tVj i^^//. 

 Hab. in Oceano Boreali, ad littora Kamtchatkae. 



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



FiSSURELLA HIANS. 



F, testd ovali, convexd, cinered, sub-radiatd, intiis albidd, margine sub- 

 purpura^cente, pellucido ; foramine magno, ovali, hiante ; long. 

 4^%, lat. 3, alt. 1^%^, poll. 

 Hab. ad littora Oceani Pacifici. 



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

 paraiso. 



*Emarginula crenulata. 



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

 long, r^, lat. ^%, 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. testd obovali, apice acuminato ; anfractibus superne depressiusculis ; 

 aperiurd rotundd, labio supemk coarctato ; long. 1, lat. yVj P^^^- 



Hab. in Oceano Boreali. 



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

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

 of the Hp. 



