133 BUI^LETIN 38 163 



4, f. 71, '88; Dall, Bull. 37, U. S. N. M., p. 166, '89; Ball, 

 and Simpson, Bull. U. S. Fish Com., i, p. 446, 1901, 



Distribution. — East Florida to Colon. Gulf coast, West 

 Florida and Texas, shallow water. 



versicolor Lamarck, Anim. s. Vert., 6, pt. 2, p. 193, 1822; Reeve, 

 Conch. Icon., 9, pi. 12, f. 56, a-d, 1855; Dall, Bull. 37, 

 U. S. N. M., p. 166, '89; Dall and Simpson, Bull. U. S. 

 Fish Com., i, p. 446, 1901. 



Distribution. — Florida Ke3's and West Florida to Colon, the 

 Antilles and Bermuda. 



Genus NERIKNA Lamarck 



rsclivata Say, Jour. Acad. Nat. Sci. Phila., 2, p. 257, 1822, (as 

 Theodoxus); Reeve, Conch. Iron., f. 34 a-b, '55; Dall, Pr. 

 U. S. N. M., 8, p. 259, pi. 17, f. 8, '85;Tryon, Man., 10, p. 

 39, pi. 12, f. 25-27, '88; Single}-, Fourth Ann. Rept. Texas 

 Geol. Surv., p. 342, 1892; Mitchell, List. Texas Shells, 

 p. 7. 



Distribution. — St. Augustine to Martinique. Gulf coast: 

 Mouth of Manatee River, Tampa, Cedar Keys and St. Mark's, 

 Fla. , Point au Fer and Chandeleurs, La. ; Port Lavaca and 

 Rockport, Tex. Pleistocene, Knapp's No. 3 well, Terre- 

 bonne Parish, La. from 1-700 feet. 



Note. — The varietj'' palmae Dall is found at Palma Sola, 

 Texas. 



virginea Linnaeus, Syst. Nat., ed. X, p. 778, 1758, {-sls Nerita); 

 Reeve, Conch, Icon., 9, pi. 21, f. 92, a-d, 1855; Dall, Pr. 

 U. S N. M., 8, p. 259, '85; Tryon, Man., 10, p. 39, pi. 12, 

 f- 31-35, 37-43; Dall, Bull. 37, U. S. N. M., p. 168, 1889; 

 Singley, Fourth Ann, Rept. Geol. Surv. Texas, p. 342, 

 1892. 



Distribution. — Florida to Brazil. Gulf coast: Various local- 

 ities of We.st Florida; Corpus Christi and Rockport, Tex. 



