148 



We have found it in Cornwall and DevonJIiire, but is 

 rather a fcarce fhell. Length rarely exceeds an inch and 

 a half; breadth not quite fo much. 



6. ' ~ * 



Dim oKTus. Pecten diftortus. Da Cojia p. 14S. t. 10. f. 3, 6. 



Pecten Puiio. Br. ZooJ. No. 65. 



Lifter Conch, t. 172. f. 9.— t. 1S9. r.23. 



Id. Angl. p. 1S6. t. 5. f. 31. 



Cheiii. Conch, vii. t. 67. f. 635. 636. 

 Oftrea Pufio. Lin. Syft. p. 1146 ? 



Gmel. Syft. p. 3324. 49. ? 



Don. Br. Shells, i. t.34. — Turt'. Lin. iv. p. 266. 

 Ortrea diftorta. Pidt. Cat. Dorfct. p. 36. 



P. with a very diftorted (hell, wiih numerous, rib-like 

 (Irije, fome of which are larger than others : the upper 

 valve is, in general, much more flat than the inferior, but 

 it is of fo diftorted a growth, that no two are found alike. 

 The under valve, by which it adheres to rocks and old 

 fliells, partakes of all the inequalities of the part to which 

 it is affixed; and fcarce any ribs or flriee are to be found 

 on that valve, except towards the umbo. The fuperior 

 valve partakes of thefe irregularities more or lefs, though 

 it is always flriated, but frequently interrupted by fwel- 

 lings and dcpreffions ; and the ftrise become undulated^ 

 In the more perfeft fliells the auricles arc large, fometimes 

 nearly equal ; in others fcarce any ears are obferved : co- 

 lour mofl commonly rufous-brown, or red and white mot- 

 tled. It raitly exceeds two inches in length: and one 



inch and a half in breadth. 



This 



