117 Bulletin 38 , 147 



canrena Linnaeus (in part) Syst. Nat., ed. X, p. 776, 1758, (aS 

 Nerita);R.etv&, Conch. Icon., 9, pi. 4, f. 14, 1S55; Tuomey 

 and Holmes, PI. Foss. S. Car., p. 115, pi, 25, f. 17, 1857; 

 Dall, Bull. 37, U. S. N. M., p. 154, '89; Tr. W. I. S., 3, 

 p. 364, '92; Maury, Bull. Amer. Pal., No. 29, p. 134, pi. 

 23, f. 10, 1917. 



plicatella Conrad, Pr. A. N. S. Phila., p. 564, 1863. 



Distribution. — Hatteras to the Antilles, Pernambuco and 

 Cartagena. Gulf coast. West Florida and Galveston. Plio- 

 cene, Caloosahatchie beds. Upper Miocene, Galveston well 

 at 2158-2920 feet. Lower Miocene, Bascom No. 2 well. Mo- 

 bile, Ala., at 1241 feet, Chipola horizon. 



alticaSlosa Dall, Trans. Wagner Inst. Sci., 3, p. 365, pi. 22, f. 

 28, 1892. 



Distribution. — -Lower Miocene, Chipola marl. Northwest 

 Florida, and of the Bascom No. 2 well, Mobile, Ala. at 1241 

 feet, Chipola horizon. 



Subgenus Cryptorjatica Dall 



pusil!a Say, Jour. A. N. S. Phila., 2, p. 257, 1822; Hilgard 

 House of Rep. Ex. Doc.,t, pt. 2, p. 886, 1878; Dall, Bull. 

 37, U, S. N. M., p. 154, pi. 50, f. 21, '89; Singley, 4th 

 x^nn. Rept. Tex., p. 341, '92; Vanatta, Pr. A. N. S. Phila., 

 55' P- 75^. 1903; Johnson, Dec. Pa. Bost. Soc. N. H., 7, p. 

 105, 1915- 



Distribution. — Maine to Florida Keys. Gulf coast: St. 

 Joseph's Ba}^ and Crooked Island, WestFla., Galveston, 

 Tex. Pleistocene, New Orleans artesian well of 1866, Lake. 

 Borgne borings, Knapp's wells, Terrebonne Parish, La., No. 

 3, at 1 150-1200, 1330-1470, 1500-1525 feet. Pliocene 

 Caloosahatchie beds, and of the New Orleans Gymnasium 

 Club well at 1200 feet. 



Genus P0L5NICES Montfort 

 Subgenus Euspjra Agassiz 



tenuis Recluz, Jour, de Conch., i, p. 388, pi. 12, f. 7, 1850; 



