210 CO^CHYLIA—D ITHYRA. 46. 



Shell about two inches in diameter, infinitely varying in colon, 

 shades and markings, with the surface very rough to the touch : 

 the outline is a little oblique, and the under valve is flatter. 



subrufus. Pecten testd fequivalvi fequilaterali glabra, radiis 20 roiun- 

 datis Itevibus. 

 Shell equivalve equilateral and smooth, with 20 rounded smooth 

 rays. 



Tab. nosL 17, fig. 1. 

 Ostrea subrufa. Donovan, British Shells, i tab. 12. 



Turton, Linn. Syst. iv. p. 264. 

 Mus. nost. From Torbay. 



Shell about an inch in diameter, of an uniform rufous-brown 

 color, and entirely smooth except a few transverse scaly marks 

 towards the margin : the valves are equal, and it has not the 

 oblique outline always observable in the Pecten opercularis, and 

 the ribs are rounded and smooth. 



sinuosus. Pecten testd suborbiculari intsquivalvi, varie distortd, radiis 

 numerosis echinatis. 

 Shell somewhat orbicular inequivalve, variously distorted, with 

 numerous prickly rays. 



Tab. nost. 9, fig. 5. 

 Ostrea sinuosa. Gmelin, Syst. p. 3819. 



Turton, Linn. Syst. iv. p. 261. 



Liinn. Trans, viii. p. 99. 



Dorset Catal p. 38, tab. 10, fig. 3 and 6. 



Dillwyn, Descript. Catal. p. 262. 



