204 PROCEEDINGS OF THE ACADEMY OF 



Genera Pholas, f. 1. Sowerby, Conch. Man. t. 2, f. 55, 55 a. Sowerby, 

 Must. Brit. Shells, t. 1. f. 8. Sowerby, Monog. Pholas. Thes. Conch, 

 ii. p. 485, t. 102, f. 10, 11 and t. 105, f. 47. Spengler, Skrivt. Nat. ii. 

 pt. 1, p. 85. Thompson, Eep. Irish Fauna, p. 263. Thorpe, Brit. 

 Mar. Conch, p. 31. Wood, Gen. Conch, t. 13, f. 13. Wood, Index 

 Test, t. 2, f. 1. Woodward, Manual, p. 328, f. 22. Wyatt, Conch, p. 

 27, t. 3, f. 3. 



Dactylina dactylus, Gray, Figs. Moll. Anim. t. 237, f . 4 and t. 238, f. 7. 

 Gray, Ann. and Mag. Nat. Hist. 2 ser. viii. p. 382. H. and A. Adams, 

 Genera, iii. t. 89, f. 2, 2 a b. Chenu, Man. Conch, ii. f. 10, 11, 13. 

 Fischer, Journ. Conchyl. 2 ser. iii. p. 49. Morch, Cat. p. 3. 

 Pholas callosa, Lamarck, Anim. sans Vert. v. p. 445. Lamarck, (Desh. edit.) 

 Anim. sans Vert. vi. p. 46. Cuvier, Reg. Anim. (edit. Croch.) t. 113, 

 f. 1. Hanley, Desc. Cat. p. 5. 

 " Mans, Pultney, Dorset. Cat. p. 26. 

 " angus litis, Petiver, Gazophyl. t. 79, f. 10. 

 " muricata, DaCosta, Brit. Conch, p. 244, t. 16, f. 2. 

 Donax sive Dactylus, Belon, de Aquat. p. 414. 

 Coquille longue, Rondelet, Hist, des Poissons, p. 16. 

 Concha longa Rondelcli, Gesner, de Crust, p. 201. 

 Concha vera Plinii, Aldrovandi, de Test. p. 454. 

 Concha longa, Aldrovandi, de Test. p. 455, f. 1, 2, 3. 

 Hob. Europe. 



Coll. Acad. Nat. Sci. Coll. Isaac Lea, LL.D. Coll. Dr. J. C. Jay. Coll. 

 Geo. W. Tryon, Jr. 



Hanley (Desc. Cat. p. 5) says, "P. oblongata, Say, is probably this shell, 

 although its beak and the number of accessory valves is not mentioned.'' Say's 

 shell does not at all resemble D. dactylus. 



P. callosa, Lam., was described from some distorted specimens of D. dac- 

 tylus. I have seen several specimens in Mr. Lea's cabinet which are greatly 

 distorted in shape, the beaks being almost central, the shell much wider than 

 usual in proportion to its length, the posterior surface worn entirely smooth, 

 and anteriorly deeply pitted, instead of the usual radiating ribs. 



Subgenus Gitocentrum, Tryon. 1862. 



D. Campechensis, Gmel. (Species.) 



Pholas Campechensis, Gmelin, Syst. Nat. 3216. Catlow, Conch. Nomenc. 

 p. 3. Hanley, Desc. Cat. p. '6, t. 9, f. 44. Jay, Cat. 4th ed. p. 10. 

 Lister, Hist. Conch, t. 432. 

 Dactylina Campechensis, (part.) Gray, Ann. and Mag. Nat. Hist. 2d ser. 

 viii. p. 382. H. and A. Adams, Genera, ii. p. 326. 

 " Campcchiensis, (part.) Fischer, Journ. Conch. 2d ser. iii. p. 49. 



Pholas oblongata. Say, Journ. Acad. Nat. Sci. 1st ser. ii. p. 320. De Kay, Moll. 

 New York, p. 248. Gibbes, in Tuumey's Geology of South Carolina. 

 Kurtz, Cat. Shells N. and S. Carolina, p. 3. Stimpson, Check List E. 

 Coast Shells. 

 " Candear.a, D'Orbigny, Moll. Sagra's Cuba, p. 215, t. 25, f. 18, 19. 



Dactylina Candeana Chenu, Manuel, ii. f. 12. 



Hob. Southern United States. West Indies. 



Coll. Acad. Nat. Sci. Coll. A. A. Gould, M. D. Coll. Wm. Stimpson, M. D. 

 Coll. Isaac Lea, LL.D. 



Lister's figure ofD. Campechensis represents very accurately a large 

 individual of this species, although it is doubtfully referred by some European 

 authors to the next species. The resemblance between this and the next shell, 

 from Western South America, is so great that it would not be surprising if their 

 identity should be established hereafter. The only difference is that our shell 



[April, 



