204 GO^GBYLIA—DITHYRA. 45. 



Mus. nost. Of foreign importation upon the bottoms of vessels, 

 from which our specimens were taken, with some small living 

 young ones attached. 



Shell about two inches in diameter, greyish white or purplish, 

 rough with foliations ; the under valve shooting at the base into 

 irregular claw-like ramifications round the margin, by which it fixes 

 itself to any hard substance : the sharp triangular plaits at the mar- 

 gin close alternately within each other, like the dovetail of joiners' 

 work : inside honey yellow, with the inner margin finely tubercled. 



edulis. OsTREA testd ovato-rotundatd foliaceo-squamosd, valvd superiore mi- 



2. ^ . . . . 



nore planata, margme interno inteffemmo. 

 Shell roundish oval, with scaly foliations, the upper valve less and 



flattened, and the inner margin very entire. 

 Ostrea edulis. Ldnn. Syst. Nat. p. 1148. 



Gmelin, Syst. p. 3334. 



Turton, Linn. Syst. iv. p. 274. 



Pennant, iv. p. 225, tab. 65, fig. 2. 



Montagu, Test. Brit. p. 151. 



Linn. Trans, viii. p. 101. 



Turton, British Fauna, p. 162. 



Dorset Catal. p. 38, tab. 11, fig. 6. 



Dillwyn, Descript. Catal. p. 280. 



Turton, Conch. Diet. p. 133. 



Chemnitz, viii. p. 48, tab. 74, fig. 682. 

 Ostreum vulgare. Da Costa, p. 154, tab. 11, fig. 6. 

 Ostrea major. Lister, Conch, tab. 193, fig. 194. 



Mus. nost. Common on rocks and in vast beds. 



