PHOLAS. 81 



CURLED PIERCER. 

 PL 15./. 3, 4, 5. 



5. Pholas crispata. Ph. testa ovali, hinc obtusicre, crispato-striata ; 



cardinis dente curvo. Linn. Syst. Nat. ed. 12. p. 1111. Linn. 



Gmel. p. 3216. 

 Shell oval, one part more obtuse, with waved striae ; hinge with a curved 



tooth. 

 Testa utrague extremitale maxime hians. Sulcus transversus in dicas 



partes valvulas dividens ; parte altera valde rugosa, et crispa, in qua ad 



cardinem margo rejlexus. Linn. Faun. Suec. n. 215. 

 List. An. Angl. t. 5. f. 38. Append, t. 2. f. 7. ■ Conch. 



t. 436. f. 279. Petiv. Gazoph. t. 79. f. 13. Penn. Brit. Zool. ed. 



1812. vol. 4. pi. 43. f. 2. Da Costa, Brit. Conch, p. 242. pi. 16. f. 4. 



Chem. Conch. 8. t. 102. f. 872-874. Encyclop. Method, pi. 169. 



f. 5, 6, 7. Donov. Brit. Shells, t. 62. Mont. Test. Brit. p. 23. 



Linn. Trans. 8. p. 32. 



The Ph. crispata is at once distinguished from every 

 other species of the genus, by a transverse groove, which 

 runs from the hinge to the margin, and divides the shell 

 into two nearly equal parts. This groove has a cor- 

 responding elevation on the inside of each valve. The 

 shell is strong, and very open at both ends ; one part is 

 smooth, except some faint transverse striae, but the 

 other portion is strongly marked with subspinous undu- 

 lations, which terminate rather abruptly before they 

 reach the transverse groove. The hinge is smooth 

 and reflex, forming a furrow towards the beak of the 

 shell. There is a plain curved tooth in each valve. 

 The general colour white, or ferruginous. Length from 

 one to two inches ; breadth from two to three inches. 

 Burrows in clay or lime- stone. Inhabits the Northern 

 ocean, and is found not uncommonly on several parts 

 of the British coast. 



We are indebted to the accurate Lister for the first 



VOL. I. G 



