PHOLAS. PWDOCK. 14? 



5. Pholas striata. Striated Piddock. 



Donovan, pi. 117 Wood, pi. 16. f. 1, 2, 3,4, and8 

 JDorwtf Cat. pi. 1. f. 7- 



Shell white, oblong or conic, rounded and obtuse at the 

 larger end, which is rough with raised curved lines and 

 nearly closed, the frontal margin folding back and forming 

 a smooth surface around it ; the narrower end gaping and 

 striate both longitudinally and transversely : hinge with a 

 somewhat heart-shaped plate at the back, the point of which 

 is upwards, beneath which is along narrow one connecting 

 the valves ; in front is a plate on each side the opening, 

 and a third narrow one down the middle : teeth long, slen- 

 der, curved : length half an inch ; breadth nearly an inch. 



Burrowed in the bottoms of ships, and floating timber. 

 v. m. 



At the close of this tribe we will take occasion briefly to 

 record a very singular testaceous production, some time 

 since found on the strand near Exmouth, by Mr. C. W. Los- 

 combe, and now in the cabinet of the Rev. Dr. Goodall, 

 provost of Eton College. It is of a ferruginous or rusty- 

 brown color, extremely thin and fragile, in shape resem- 

 bling the Pholas Candida, closed at the larger extremity, 

 and gaping at the other, where it is invested with a distinct 

 circular appendage, completely inclosing the smaller ex- 

 tremity, and extending like a broad open ring beyond it. 

 This supplemental ring appears to stand in the place of the 

 dorsal valves which are wanting. It has not the prickly 

 ridges at the larger end ; but the back is rather flattened 

 and strongly wrinkled, like that of the Pholas Dactylus. 

 The internal conformation it was impossible to examine 

 without the destruction of this curious and unique speci- 

 men ; but from its general appearance it may be reasonably 

 supposed to possess the hinge and the teeth of a Pholas. 

 A beautiful plate of this most rare and unknown produc- 

 tion has been engraved for Mr. Loscombe, by Mr. Sowerby; 

 and in the present uncertainty as to its generic appropria- 

 tion, its fortunate possessor denominates it P 

 Loscombiana. 



o 2 PINNA. 



