Bulletin 34 70 



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

 Distribution. — Xorth Carolina to the Antilles, California to 

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

 West Florida. 



Genus CONGERIA Partsch 

 ieucopheata Conrad 



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



6. p. 263, pi. II, fig. 13, 1S31. 

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



p. 167, '57. 

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



43. '58. 

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



Mus. . p. 40, '89. 

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

 808, 189S. 

 Distribution. — :^Iar\-land to the Antilles and Nicaragua. Pleis- 

 tocene to Recent. True Dreissensia is European. Gulf 

 coast. — West Florida, Point au Fer and 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, No\-itates Conch. Moll, marina, 1858; 

 Reeve, Conch. Icon., f. 45, 1S58 ; Dall, Trans. Wag. Inst. 

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

 sa/iei RQevQ, Conch. Icon., f. 44, 1S5S. Not of Recluz, 1852. 

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



more triangular and heavier than Ieucopheata. 

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

 at 2123-2873 feet. L'pper Miocene horizon. 



Genus PER I PLOW A Schumacher 



angjlifera Philippi, Zeitschr. fur Malak. for 1847, P- 73: ^oe- 

 msr, Texas, p. 452, '49; Dall, BliII. 37, p. 64, '89 ; 

 Single}', Fourth Ann. Rept., Geol. Surv. Texas, p. 330, 

 1S93 ; Dall, Trans. Wagner Inst. Sci., 3, pt. 6, p. 1529, pi- 



