26 Bulletin 34 5^ 



Trans. Wagner Inst. Sci., 3, pt. 4, p. 672, 1898. 

 Distribution. — N. Carolina to Florida. Gulf coast. — Char- 

 lotte Harbor, Fla. 



Genus UNIO Philippson 

 tetralasmus var. declivis Say 



dedivisSa.y, Transylvania Jour., vol. 4, p. 527, 1831 ; Amer. 

 Jour. Conch., vol. 3. pi. 35, 1832. 



Var. declivis Simpson, Proc. U. S. Nat. Mus. , vol. 22, p. 

 740, 1900. 

 Distribution. — U. tetralasmus and its varieties, inhabits the 

 Lower Mississippi drainage area north to Lat, 40° ; Ala- 

 bama River System and extends west through Texas into 

 Northern Mexico. Pleistocene : pumping station No. 7, 

 New Orleans. 



Genus QUADRULA Rafinesque 

 apiculata Say 



Unio apiculatus Say, New Harm. Diss., vol. 2, No. 2, p. 309, 

 1829 ; Amer, Conch., 6, pi. 52, 1834 ; Conrad, New Fresh 

 Water Shells, p. 67, 1834 ; Conrad, Monog, Uniondae, p. 

 78, pi. 44, fig. I, 1836. 



nobilis Conrad, Jour. Acad. Nat. Sci., Phila., p. 297, pi. 27, 

 fig. 2 (not 3), 1854. 



Quadrula apiailata Simpson, Proc. U. S. Nat. Mus., vol. 22, 

 p. 778, 1900. 

 Distribution. — Rivers and Lakes, Louisiana to Texas, with 

 Quadrula trapazoides Lea in Indian shell heaps, Lake 

 Charles, La. Pleistocene : Knapp's No. 3 well, Terre- 

 bonne Parish, 500 ft. 



Genus PECTEN Miiller 

 phrygium Dall, B. M. C. Z., 12, p. 217, '86 ; Bull. 37, U. S. 

 N. Mus., p. 34, pi. 40, fig. I, '89. 

 Distribution. — Hatteras to Grenada, 50-792 fms. Yucatan 

 Banks, Lat. 23° N., Long. 88° W. 

 Eiivola) ziczac Linnaeus 



ziczac Wxvu. , Syst. Nat., p. n44. 



