I30 Mollusc A of the Gulf op Mexico 100 



surface exposure. Brackish water formation. 



satillensls Aldrich, The Nautilus, 24, pt. 11, p. 132, pi. 8, f. i, 

 la-c, 1911, (as Potamides); Dall, Pr. U. S. N. M., p. 232, 

 1914. 



Distribution. — -Upper Miocene or Pliocene. Satilla River, 

 Ga., and Burkeviile, Tex. Brackish water formation. 



suavis Dall, Proc. U. S. N. M., 46, p. 232, pi. 21, f. 6, 9, 1614. 



Distribution. — Upper Miocene or Pliocene. Well near Al- 

 exandria, Ua., at 49 feet, and v*^ell, Pine Prairie oil field, 

 La., at 1540 feet. Also surface exposure, Burkeviile, Tex. 



Genus CAECUiVl Fleming- 

 florid anum Stimpson, Pr. Best. Soc. N. H., 4, p. 112, 1851; 

 Tryon, Man., 8, p. 217, pi. 66, f. 62, '86; Dall, Bull. 37, 

 U. S. N. M., p. 142, '89; Tr, W. I. S. 3, p. 298, '92. 



irregulare A^ Folin, Jour, de Conch., 15, p. 46, pi. 3, f. 6, 

 1867. 



annulaium ^vatnons, Rept. Geol. N. Car., p. 274, f. 190,' 58. 

 Not of Brown, 1844. 



. Distribution. — Hatteras to Bahia, Brazil. Also West Fla. 

 2-18 fms. Pliocene, Caloosahatchie, Fla. 



instructum de Folin, Fonds de la Mer; Dall, Bull. 37, U. S. N. 

 M., p. 142, '89. 



Distribution. — Hatteras to Tampa, West Fla. Pliocene to 

 Recent. 



bipariitum de Folin, Fonds de la Mer; Dall, Bull. 37, U. S. N. M., 

 p. 142, '89. 



Distribution. — Hatteras and West Florida. 



carolinianum Dall, Trans. Wagner Inst. Sci., 3, p. 300, pi. 22, f. 

 25, 1892; Bull. 37, U. S. N. M., p. 142, 1889, (name 

 only). 



