PHOLAS. PIDDOCK. 
W 
5. Pholas striata. Striated Piddock. 
Donovan, pi. 117 — Wood, pi. 16. f. 1, 2, 3,4 , and 8—. 
Dorset 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 a long narrow one connecting 
the valve3 ; 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, 
r. 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. YV. 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 
rdges at the larger end ; hut 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. Sowerbyj 
and in the present uncertainty as to its generic appropria¬ 
tion, its fortunate possessor denominates it Pholadidea, 
ffl,3combmna. 
o 2 
PINNA. 
