MOLLUSCA OF TI-IE GULF OF MEXICO II4 



Borgiie borings, New Orleans well of 1856, and Nev/ Orleans 

 pumping station No. 7. Pliocene, Caloosahatchie beds. 

 Lower Miocene Chipola beds, West Fla. 



plana Say, Jour. A. N. S. Phila., (i), 2, p. 226, 1822; Tuomey 

 and Holmes, PI. Foss, S. Car., p. iii, pi. 25, f. 12, 1857; 

 Ball, Bull., 37, U. S. N. M., p. 152, pi. 48, f. 12, pl. 50, f. 

 26, '89; Tr. W. I. S., 3. p. 358, '92: Vanatta, Pr, A. N. S. 

 Phila., 55, p. 758, 1903; Johnson, Occ. Pa.Bost. Soc. N. H., 

 7, p. no, 1915. 



Distribution. — Canada to Trinidad, W. I. Gulf coast: Cedar 

 Keys, St. Mark's, Fla.; Chandeleurs,La. ; Galveston, Corpus 

 Christi and Matagorda Baj^s, Texas. Pleistocene, New Or- 

 leans pumping station No. 7 and North Creek, Fla. 

 Pliocene, New Orleans Gymnasium Club well at 1200 feet, 

 and Caloosahatchie beds, Fla. Lower Miocene Chipola beds. 

 West Fla. and of the Bascom No. i well, Mobile, Ala., at 

 1 500- 1 556 feet, Chipola horizon. 



acyleaia Gmelin, S^^st. Nat., 7, p. 3693, 1792, {Patella); Tryon, 

 Man., 8, p. 129, pl. 39, f. 61-62, 1886; Ball. Bull. M. C. Z., 

 18, p. 286, i88g; Vanatta, Pr. A. N. S. Phila., 55, p. 758, 

 1903: Ball, Bull. 112, U. S. N. M., p. 162, 1921. 



Distribution. — Cape Lookout, N. C, to Barbados. Gulf 

 coast: Indian Pass, West Fla., and Texas. Usually 0-25 

 fms. , but dredged in Gulf of Mexico, near Tortugas at 539 

 fms. Dwarfed and white at that depth. Also Pacific Ocean, 

 California to Chile. Pliocene, Caloosahatchie beds, West 

 Florida. 



GOnvexa Say, Jour. A. N. S. Phila., (i), 2, p. 227, 1822; Dall, 

 Bull. 37, U. S. N. M., p. 152, pl. 50, f. 25, 1S89; Tr. W. 

 I- S., 3, p. 357, '92. 



Distribution. — Nova Scotia to Florida. Gulf coast: West 

 Fla.; Chandeleurs, La.; Galveston, Tex. Pleistocene, North 

 Creek, West Fla. 



