38 



Bulletin 34 



70 



Checklist N. W. Coast, p. 19, 191 6. 

 Distribution. — North Carolina to the Antilles, California to 

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

 West Florida. 



Genus C0NGER1A Partsch 



leucopheata Conrad 



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



6, p. 263, pi. 11, fig. 13, 1831. 

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



P- 167, '57. 



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

 43, '58. 



Dreisse?isia {Mytilopsis) leucopheata Dall, Bull. 37, U. S. N. 



Mus., p. 40, '89. 

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



808, 1898. 



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

 tocene to Recent. True Dreissensia 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, 

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

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

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

 sallei 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 Conger ia was found by Harris in the Galveston well 

 at 2123-2873 feet. Upper Miocene horizon. 



Genus PERSPLOSVIA Schumacher 



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

 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- 



