NATURAL SCIENCES OP PHILADELPHIA. 207 



T. explan.ata, Spengler. (Sp.) 



Pholas explanata, Spengler, Skrivt. Nat. ii. pt. 1, 1791. 



Talona explanata, Gray, Ann. and Mag. Nat. Hist. 2d ser. viii., 1851. 

 H. and A. Adams, Genera, iii. t. 90, f. 2, la. Fischer, Journ. Conch. 

 2d ser. iii. p. 51. Morch, Cat. p. 3. 

 Pholas clausus, Gray, in Bowdich, Elera. 1822. Catlow, Conch. Nomenc. p. 3. 

 Hanley, Desc. Cat. p. 6, t. 11, f. 8. Jay, Cat. 4th ed. p. 10. Sowerby, 

 Monog. Pholas. Thes. Conch, ii. p. 498J t. 107, f. 74, 75. 

 Talona clausa Chenu, Man. Conch, ii. f. 34, 35, 1862. 

 Pholas Candidas, Chemn, Conch. Cab. viii. f. 862, 1785. 

 Hah. Western Africa. 



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

 G. W. Tryon, Jr. 



Genus Barnea, Leach. 



Barnea, Leach, teste Risso, Hist. Nat. iv. p. 376, 1826. 



" Risso, H. and A. Adams, Genera, ii. p. 326, 1853. 

 Barnia, Gray, Ann. and Mag Nat. Hist. 2d ser. viii. 1851. Leach, Moll. Great 

 Britain, p. 254, 1852. 



Typical Species. 



Margins of the valves regularly rounded, hiatus long and narrow. 



B. Australasise, Gray. 



Barnia Australasias, Gray, Brit. Mus. Gray, Ann. and Mag. Nat. Hist. 2d 

 ser. viii. p. 381. 



Barnea Australasise, Fischer, Jo jrn. Conch. 2d ser. iii. p. 49. H. and A. 



Adams, Genera, ii. 

 Pholas Australasiaa Sowerby, Mon. Pholas, Thes. Conch, ii. p. 488, 1. 106, 

 f. 73. 

 Hab. Australia. 



This shell closely resembles B. c a n d i d a of England, but may be at once 

 distinguished by its much larger size and more anterior position of the umboaes. 



B. Burmanica, Philippi. (Sp. ) 



Pholas Birmanica, Pailippi, Neiier Conchyl. iii. Pholas. t. 1, f. 1. 



Barnia Burmanica, Gray, Ann. and Mag. Nat. Hist. 2d ser. viii. p. 382. 



Barnea Burmanica, H. and A. Adams, Genera, ii. p. 326. 



Pholas Bakeri? Deshayes, Woodward's Manual, t. 23, f. 19. 



Barnea Bakeri? H. and A. Adams, Genera, ii. p. 326. 



Hab. Burmah. 



The shape and sculpture of this shell, as figured by Philippi, remind one 

 strongly of our P. c o s t a t a ; it is much broader than either of the other species 

 of this section of Barnea. 



B. Bakeri I have not seen, nor could I find the original description; but the 

 figure in Woodward appears to be the same as Burmanica. 



B. Candida, Linn. (Sp.) 



Pholas Candida, Linnaeus, Syst. Nat. 1111. Linnaeus, Mus. Ulric, p. 469. 

 Alder, Cat. Northumb. Moll. p. 100. Bosc, Hist. Nat. des Coq. ii. p. 

 195. Bouchard-Chantereau, Moll. Boulon, p. 7. Brown, 111. Conch. 

 Great Britain, p. 115, t. 48, f. 6 10. Bruguiere, Encyc. Meth. t. 168, 

 f. 11. Burrow, Elem. t. 3, f. 4. Catlow, Conch. Nomenc. p. 3. Chem- 

 nitz, Conch. Cab. viii. p. 358, t. 101, f. 861. Collard des Cherres, Cat. 

 Moll. Finisterre, p. 9. Crouch, Introd. Lam. t. 2, f. 11. DaCosta, 

 Brit. Conch, p. 246. Deshayes, Moll. Expl. Sci. de l'Algerie, p. 109, 

 t. 9, D. I. f. 4, 5, (Animal.) Deshayes, Traite Elem. i. pt. 2, p. 79, t. 



1862.] 



