90 MoivI.USCA OF THE GULF OP MEXICO 6o 



Cameron, La. ; Galveston and Corpus Christi, Tex. Pleisto- 

 cene, Knapp's wells, Terrebonne Parish, No. i at 1600-2443 

 feet. No. 2, 1050-1842, No. 3, 58-1839 feet, New Orleans 

 ar.esian well of 1856, Lake Borgne borings. Pliocene, New^ 

 Orleans Gymnasium Club well at 1200 feet. Upper Mio- 

 cene, Galveston well, 2871 feet. Miocene, Gilbert well No. 

 10, Bateson, Texas at 323 feet. 



consensus Ravenel, Pr. A. N. S. Pliila., p. 43, 1861; Dall, Bull. 

 M. C. Z., 18, p. 185, '89. 



Distribution. — North Carolina to Florida. S-49 fnis. Gulf 

 coast 20 miles off Charlotte Harbor, W. Fla., at 13 fms. 



hotessieri d'Orbigny, Moll. Cuba, 2, p. 142, 1845, Atlas, pi. 21, 

 f. 40-42, {SiS Nassa}] Dall, Bull. M. C. Z., 18, p. 185, 1889; 

 Dall & Simpson, Bull. U. S. Fish Com., i, p. 403, 1901. 



Distribution. — Gulf of Mexico, Blake station 36, at 84 fms. 

 Also Hatteras and Sombrero, 30-85 fms. 



galvestonensis Harris, Bull. Am. Pal., vol. i, p. loi, pi. 4, f. 2, 

 1895. 



Distribution. — Upper Miocene, Galveston well at 2410-287 1 

 feet. 



trigalvestus Harris, Bull. Am. Pal., vol. i, p. loi, pi. 4, f. 

 3- 1895. 



Distribution. — Upper Miocene, Galveston w^ell at 2 158-2871 

 feet. 



obsoSetus Say, Jour. A. N. S. Phila., (i) 2, p, 232, 1822, (as 

 Nassa)\ Gould, Inv. Mass., pi. 15, f. 210; Dall, Bull. 37, 

 U. S. N. M., p. 116, pi. 50, f. 9, 1889; Johnson, Occ. Pa. 

 Bost. Soc. N. H., 7, p. 135, £915; Dall, Bull. 112, U. S. N. 

 M., p. 103, 1921. 



Distribution. — Nova Scotia to Tampa, West Fla. Also San 

 Francisco Bay, (introduced with oysters from the Atlantic). 



