PHOLAS. 81 



CURLED PIERCER. 

 PL 15./. 3, 4, 5. 



5. Pholas crispata. Ph. testa ovali, hinc obtusiore, 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 utraque extremitate maxime hians. Sulcus transversus in duas 



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



cardinem mar go refiexus. Linn. Faun. Svec. 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 



