68 Bulletin 34 100 



1901 ; Vanatta, Proc. A. N. S. Phila., 55, p. 757, '03; 

 Dall, Tr. W. I. S., 3, p. 1254, '03 ; Vaughan, Piibl. 133, 

 Carn. Inst., p. 171, 1910. 

 gigantea Chemnitz, Conch Cab. 10, p. 354, pi. 171, f. 1661, 

 1788; GmeHn, Syst. Nat., 6, p. 3282, 1792; Lamarck, 

 An. s. Vert. 5, p. 564, 1818; DeKay, Zool. New York, 

 Moll., p. 216, '43 ; Conrad, Am. Jour. Sci., p. 44, '46 ; 

 Sowerby, Thes. Conch. 2, p. 628, pi. 131, f. 86, '51 ; 

 Holmes, Post-Plio. Fos. S. C, p. 36, pi. 7, f. 3, '60 ; 

 Reeve, Conch. Icon., 14, Dione, pi. 5, f. 17,* 63 ; Coues, 

 Proc. A. N. S., Phila., p. 136, '71 ; Dall, Bull. 37, U. S. 

 N. M.,p. 56, '89 ; Singley, 4th Ann. Rept. Tex., p. 327, 

 '92 ; Mitchell, List Tex. Sh. 

 Distribution — Hatteras to Cuba (?) Pliocene to Recent. 

 Gulf coast. — Recent : Ft. Barranca, Fla, Mobile, Ala., 

 Matagorda Bay, Tex. Pleistocene : Osprey, Orient and 

 Labelle, Fla. Pliocene : Caloosahatchie beds. 

 (Paradione) maculata Linnaeus, S5'st., Nat. ed. X, p. 686, 1758, 

 {dJsVenus); Lamarck, An. s. Vert., 5, p. 566,1818; Sowerby, 

 Conch. Man., fig. 117 d, '42 ; Thes. Conch. 2, p. 629, pi. 

 131 - f- 97, '51 ; Gabb, Jour. A. N. S. Phila., 2d Ser., 8, 

 p. 344, '81 ; Dall, Tr. W. I. S., 3, p. 1256, 1903. 

 Cytherea dariena Conrad, Pac. R. R, Rept. 6, p. 72, pi. 5, 

 f. 21, 1857. Not Meretrix dariena Conrad, which is 

 dementia dariena. 



Distribution. — Hatteras to Brazil. Miocene to Recent. Gulf 

 coast. — Recent : Ft. Barranca, St. Joseph's Bay, Crooked 

 Island, etc., Fla. ; Horn Island, Miss. ; Chandeleurs, La; 

 Matagorda Bay, Mustang Island, Corpus Christi, Texas. 

 Pliocene : Caloosahatchie. Miocene : Chipola marl, Cal- 

 houn Co. ; Oak Grove sands, Santa Rosa Co., Fla. ; Bas- 

 com well. Mobile, Ala. at 1241 feet. 



Genus CALLOCARDIA A. Adams 



vesica Dall, Bull. Mus. Comp. Zool. Harv. Coll., 12, p. 275, 1886, 

 (as Cytherea); Bull. 37, U. S. N. M., p. 56, '89 ; Proc. U. 



