97 BuivLETTN 38 , I.2[ 



Distribution. — Cedar Keys, Fla., to the Bahamas. Pliocene 

 of Shell Creek, Fla. 



hegewishi Philippi, Mai. Blatt., 23, p. '89; Zeitschr. fur Malak., 

 p. 19, 1841; Singley, 4th Ann. Rept. Tex., p. 339, 1892; 

 Mitchell, List Tex. Sh. 



Distribution. — Cited by Singley and Mitchell from Matagor- 

 da, Carancahua and Corpus Christi Bays, Texas. 



I Genus POTAMIDES Brongniart 



matsoni Dall, Pr. U. S, N. M., 46, p. 231, pi. 21, f. i, 2, 7, 

 1914. 



Distribution. — Well near Alexandria, La., at 49 feet; well 

 at Pine Prairie, La., at 1540 feet; surface near Burkeville, 

 Texas. 



Note. — The brackish water molluscan fauna of Burkeville, 

 Texas; Alexandria and Pine Prairie, La., was referred in 

 19 1 4 by Dr. Dall to the Pliocene. Dr. W. D. Matthew thought 

 the mammalian remains (tibia of a rhinoceros and upper 

 molar of a horse, either Profoktppus or Merychippus) indicat- 

 ed a Late Miocene or Early Pliocene age. For discussion of 

 the Burkeville beds (lower member of the Fleming clay) see 

 Dumble, Univ. Tex. Bull. No. 1869, pp. 224-225, 1918. The 

 stratigraphic relation of the Burkeville beds rather sug- 

 gests an Upper Miocene horizon. 



matsoni var. graciiior Dall, Pr. U. S. N. M., 46, p. 231, 1914. 



Distribution. — Well near Alexandria, La., at 49 feet; well 

 at Paririe Bluff, La.; near Burkeville, Tex. 



Genus ALAB8NA Dall 



adamsi Dall, Bull. M. C. Z., 18, p. 258, '89; Bull. 37, U. S. N. 

 M., p. 140, '89; Tr. W. I. S., 3, p. 276, '92, (All as 

 Bttthim) . 



