222 COI^CEYLIA—DITHYRA. 49. 



Tab. nost. 20, %. 1. 

 Pinna ingens. Pennant, Brit. Zool. iv. p. 244. 



Montagu, p. 180, 583, and Suppl. p. 72. 



Linn^ Trans, viii. p. ] 12. 



Turton, British Fauna, p. 165. 



Dillwyn, Descript. Catal. p. 325. 



Turton, Conch. Diet. p. 148. 

 Pinna lasvis. Donovan, British Shells, v. tab. 152. 



Mas, nost. From the Devonshire coast. 



Shell growing to a foot or more in length, and half as much in 

 breadth, horn color and semitransparent, rather flattened at the 

 broader extremity, from which it runs down on the open side in a 

 nearly straight line for about half its length, and then slopes sud- 

 denly towards the pointed end ; the surface is marked with about 

 eleven obscure longitudinal ribs which extend over three-fourths from 

 the anterior margin. 



fiiigilis^. Pinna testa ovatd, striis transversis arcuatis, apice rotundato, latere 

 postico producto rotundato. 

 Shell oval, with transverse arched strite, rounded at top, jsroduced 

 and rounded at the hinder side. 



Tab. nost. 20, fig. 2. 

 Pinna pectinata. Pennant, British Zool. iv. tab. 72. 

 Mus. nost. From the Devonshire coast. 



Shell about six or seven inches long, and is marked like the 

 last, but is of a darker horn-color, and more flattened .• it differs 

 also much in the outline, being broader in proportion to its 



