114 PnOLADIDJE. 



the cells of the former, and of the channel of the latter ; com- 

 pared to which, it is narrower and smaller, the average size 

 rarely exceeding an inch and a quarter in length, and about 

 half an inch in breadth. The Pholas tuherculaia of Turton 

 is only a monstrosity of this species, as we have ascertained 

 by the examination of his own imique specimen, which, to- 

 gether with the rest of his collection, is now in the posses- 

 sion of Mr. Gwyn JeiFreys, of Norton, near Swansea. 



The description given by Lamarck of his Ph. callosa 

 sufficiently accords with the characteristics of this species ; 

 the synonymy of the recent edition of the " Animaux sans 

 Vertebres" indicates, however, a mere variety of dactylus. 



Pholas Crispata, Linnaeus. 



Valves abbreviated, beaked, divided by a radiating grove with- 

 out dorsal cells : dorsal plate rudimentary. 



Plate IV. figs. 3, 4, 5. 

 Pholas crispata, Linn. Syst. Nat. p. 1111. — Penn. Br. Zool. ed. 1, vol. iv. p 

 77, pi. 40, f. 12.— Donov. Br. Shells, vol. ii. pi. 62— Pul- 

 TENEY, Dorset, p. 27. — Mont. Test. Brit. p. 23. — Linn. 

 Trans, vol. viii. p. 32. — Turt. Conch. Diet. p. 146 ; Dithyr. 

 Brit. p. 6. — Flem. Brit. Anim. p. 456. — Brown, 111, Conch. 

 G. B. p. 114, pi. 48, f. 1 to 5. — M'G. Moll. Aberd. p. 306 ; 

 Brit. Marine Conch, p. 29. — Dillw. Recent Shells, i. p. 40. 

 Wood, Gen, Conch, p. ill, pi. 1,5, f, ,S, 4, 5.— Hani,. Recent 

 Shells, p, 7, pi. 2, Phol. f. 5 ; Index Testae, pi. 2, Phol, f. 5, 

 Spengl. Skrivt. Naturhist. Selsk, vol. ii. part 1, p, QG. — 

 Lam. Anim. s. Vert. ed. 2, vol. vi, p. 46. — Chemn, Conch. 

 Cab. vol. viii. p. 369, pi. 102, f. 872, 873, 874.— Gould, 

 Invert, Massach, p. 27. — Cuv. Regne Anim. ed. grande, pi. 

 113, f. 3 (animal).- Dekay, New York Mollusc, p, 247, pi. 

 32, f, 506, 



„ hisfrons, Da Costa, Brit. Shells, p. 242, pi, 16, f, 4. 



„ parva, „ „ p, 247. — Doxov. Brit. Shells, ii. pi. 69. 



— Encycl. Meth. Vers, pi. 169, f, 5.— List, Hist, Conch, pi. 

 436, f. 279. 



This coarse-looking shell is of a somewhat oval shape, 

 rather strong (often becoming thick and heavy in aged in- 

 dividuals), greatly inflated, dull whitish, inequilateral, and 



