86 MOLIvUSCA OF THE GULF OF MEXICO 56 



gard, House of Rep., Ex. Doc, i, pt. 2, p, 886, '78; Dall, 

 Bull. 37, U. S. N. M., p. 112, pi. 73, f. I, '89; Clark, Pleis- 

 tocene Md., p, 180, pis. 46, 47, 48, 1906; Johnson, Occ. Pa. 

 Bost. Soc. N. H., 7, p. 139, 1915. 



Distribution. — Cape Cod to West Florida and Texas. 

 Pliocene (Carolinas). Pleistocene, New Orleans well of 

 1856 (Hilgard). 



rsum I^innaeus, Syst. Nat., p. 1222, 1766, (as Micrex); 

 Tuomey & Holmes, PI. Fos. S. C , p. 145, pi. 29, f. 3,1856; 

 Hilgard, House of Rep. Ex. Doc. i, pt. 2, p. 886, '78; Dall, 

 Tr. W. I. a., 3, p. 116, '90; Vanatta, Pr. A. N. vS. Phila., 

 55, P- 757> 1903; Vaughan, Publ. 133, Carn. Inst., p. 171, 

 1910. 



Distribution. — Hatteras to Cuba. Miocene (Carolinas) to Re- 

 cent, 0-3 fms. Gulf coast: Cedar Keys, St. Marks, &c., 

 Fla. ; Point au Fer, Cameron, I^a. ; Galveston and Corpus 

 Christi, Tex. Exceedingly abundant in the Pleistocene of 

 Grand Chenier, La., and found by Hilgard in the Lake Bor- 

 gue borings; also of Manatee, Orient, and Labelle, West Fla. ; 

 Pliocene, Caloosahatchie beds, Fla. 



carica Gmelin, Syst. Nat., p. 3545, 1792, (^rs, Miirex); Holmes, 

 Post-Pl. Fos. S. C.,p. 65, pi. II, f. I, 1859; Dall, Bull. U. S, 

 N. M., p. .112, pi. 74, f. I, '89; Clark, Pleistocene, Md., p. 

 179, pis. 43-45, 1906; Johnson, Occ. Pa. Bost. Soc. N. H., 

 7, P- 139, 1915- 



Distribution. — Massachussetts to the Antilles, o-io fms. 

 Gulf coast, West Florida and Galveston, Tex. 



eilceans Montfort, Conch. Syst. 303; Dall, Bull. 37, U. S. N. M., 

 p. 112, '89. 



Distribution. — South Carolina to Campeche. 0-5 fms. 



Genus [V5ELON6ENA Schumacher 



corona Gmelin, Syst. Nat., p. 3552, 1768; Tryon, Man., 3, p. 

 108, pi. 41, f. 199-203, 1881; Dall, T.. W. I. S., 3, p. 121, '90; 



