99 Bulletin 38 • I39 



galvestonense Harris, Bull. Amer. Pal., vol. i, p. 104, pi. 4, f. 8, 

 1895. 



Distribution. — Upper Miocene, Galveston well at 2550-287 £ 

 feet. 



Genus MODULUS Gray 



modulus lyinnseus, Syst. Nat., ed. X, p. 757, 1758, (as Trochzis)-, 

 Dall, Bull. 37, U. S. N. M., p. 142, 1889; Singley, 4th Ann. 

 Rept. Tex. G. S., p. 339, '92; Dall and Simpson, Bull. U. 

 S. Fish Com., i, p. 427, 1901. 



lenticularis Chemnitz, Tryon, Man., 9, p. 261, pi. 48, f. 91,92, 

 1887. 



Distribution. — Ilatteras to Brazil and to Cartagena, Colom- 

 bia. Gulf coast: West Florida, Chandeleurs,La.; Galveston, 

 Corpus Christi, and Espiritu Santo Baj^ Tex. Between 

 tides. Pliocene, Caloosahatchie and Shell Creek, Fla. Up- 

 per Miocene, Galveston well at 2552-2871 feet (identifica- 

 tion doubtful). 



floridanus Conrad, Amer. Jour. Conch., 5, p. 107, pi. i2,f. 6, '70; 

 Hilgard, House of Rep. Ex. Doc, i, pt. 2, p. 887, 1878; 

 Dall, Pr. U. S. N. M., 6, p. 335, '83; Bull. 37, U. S. N. 

 M., p. 142, '89; Tr. W. I. S., 3, p. 295, '92; Vaughan, 

 Publ. No. 133, Carn. Inst., p. 171, 1910. 



Distribution. — Hatteras to St. Thomas, W. I. Gulf coast, 

 Cedar Keys and St. Mark's, West Fla. Pleistocene, Uake 

 Borgne borings, Ua., and North Creek and Labelle, Fla. 

 Pliocene, Caloosahatchie beds, Fla. and of the New Orleans 

 Gymnasium club well at 1200 feet. 



Genus PACHYCHESLUS Lea 



anagrammatus Dall, Proc. U. S. N. M., 46, p. 232, pi. 21, f, 

 5, 8, 1914. 



Distribution. — Upper Miocene or Pliocene. Well near 

 Alexandria, La., at 49 feet. Also near Burkeville, Texas, 



