216 COSCHYLIA^^DITHYRA. 47. 



This beautiful little shell, which seems to have been known to 

 Lister as an inhabitant of our islands, but has since been over- 

 looked, we found imbedded among the rocks in the neighbourhood 

 of Torquay, to which they are sliglitly attached. 



The surface is always regular and never distorted : the valves 

 are equal ; and one of the auricles is nearly obliterated. The 

 figure is also different from the Pecten distortus of the same size, 

 being more regularly oval-oblong. 



The number of its rays, and their being alternately larger and 

 lesser, distinguish it from the Pecten varius, independently of 

 its constant habitation in rocks. 



isiandicus. Pecten tcstd subtsqvivalvi, striis numerosis rotundatis bijidis 

 scabris. 

 Shell nearly equivalve, with numerous rounded cloven rough 



strife. 

 Ostrea Islandica. Gmelin, Syst. Nat. p. 3-326. 



Ttirton, Linn. Syst. iv. p. p. 267. 

 Turton, Conch. Diet. p. 258. 

 Ostrea cinnabarina. Dillwyn, Descript. Catal. p. 256. 

 Pecten Isiandicus. Chemnitx, vii. p. 314, tab. 65, fig. 615, 616. 

 Lister, Conch, tab. 1057, fig. 4. 



Some specimens have, we understand, been taken on the 

 northern shores of the Scottish islands. Those from which we 

 drew the description in the Conchblogical Dictionary, appear to 

 have been brought from Newfoundland. 



