38 BUI.I.ETIN 34 70 



Checklist N. W. Coast, p. 19, 19 16. 

 Distribution. — North Carolina to the Antilles, California to 

 Peru, Red Sea. Upper Oligocene (of Tampa) to Recent, 

 West Florida. 



Genus COMGERIA Partsch 

 leucopheata Conrad 



Mytilus leucopheatus Conrad, Jour. Acad. Nat. Sci,, Phila,, 



6, p. 263, pi. II, fig. 13, 1831. 

 Myiilopsis leucopheatus Conrad, Proc. Acad. Nat. Sci., Phila., 



P- 167, '57. 

 Dreissena americana Reeve, Conch., Icon., 10, pi. 10, fig. 



43, '58. 

 Dreissensia {Mytilopsis) leucopheata Dall, Bull. 37, U. S. N. 



Mus., p. 40, '89. 

 lc7icophcata Dall, Trans. Wagner Inst. Sci., vol. 3, pt. 4, p. 

 808, 1898. 

 Distribution. — Maryland to the Antilles and Nicaragua. Pleis- 

 tocene to Recent. True Dreissejisia is European. Gulf 

 coast. — West Florida, Point au Ferand Lake Charles, La. 

 Pleistocene: North Beach, Fla., Knapp's wells, Terre- 

 bonne Parish, No. 2 at 1542-1632, 1550-1570, No. 3 from 

 the surface to 700 feet, 1040- 1043, 1865-2029 feet. 

 rossmassieri Dunker, Novitates Conch. Moll, marina, 1858 ; 

 Reeve, Conch. Icon., f. 45, 1858 ; Dall, Trans. Wag. Inst. 

 Sci., 3, pt. 4, p. 809, '98. 

 sallez Reeve, Conch. Icon., f. 44, 1858. Not of Recluz, 1852. 

 Distribution. — Florida to Brazil. Gulf coast. — Tampa. Shell 



more triangular and heavier than leucopheata. 

 Note. — A Congeria was found by Harris in the Galveston well 

 at 2123-2873 feet. Upper Miocene horizon. 



Genus PERIPLOMA Schumacher 



angulifera Philippi, Zeitschr. fur Malak. for 1847, P- 73; Roo- 

 mer, Texas, p. 452, '49; Dall, Bull. 37, p. 64, '89 • 

 Singley, Fourth Ann. Rept., Geol. Surv. Texas, p. 330, 

 1893 ) Dall, Trans. Wagner Inst. Sci., 3, pt. 6, p. 1529, pi- 



