784 PROCEEDINGS OF THE \ATIO\.\L MUSEl'M. VOL.XXII. 



t QUADRULA INFUCATA Conrad. 



* Unio infucatus CONRAD, New F. W. Shells, 1834, p. 45, pi. in, fig. 2, p. 70.* MOL- 



LEH, Syu. Nov. Gen., 1836, p. 208. * FKRUSSAC, Guer. Mag., 1835, p. 29. 



* HANLKY, Test. Moll., 1842, p. 203 ; * Biv. Shells, 1843, p. 203.* CHENU, Bib. 

 Conch., 1st ser., Ill, 1845, p. 22, pi. n. fig. 6. * CATLOW and REEVE, Conch. 

 Norn., 1845, p. 60.* CONRAD, Pr. Ac. N. Sci. Phila., VI, 1853, p. 250.' II. and 

 A. ADAMS, Gen. Rec. Moll., II, 1857, p. 497.* KUSTEH, Conch. Cab. Unio, 1861, 

 p. 176, pl.LV, fig. 5. *SOWERBY, Conch. Icon., XVI, 1866, pi. XL, fig. 221. 



* B. H. WRIGHT, Check List, 1888.* P^ETEL, Corch. Sam., Ill, 1890, p. 155. 

 " SIMPSON, Pr. U. S. Nat, Mus., XV, 1892, p. 409, pi XLIX, figs. 1-3, 6. 



* Margarita ( Unio) infucatus LEA, Syn., 1836, p. 34; 1838, p. 23. 



* Margaron ( Unio) infucatus LEA, Syn., 1852, p. 20; 1870, p. 30. 



*Unio securiformis CONRAD, 'Ann. and Mag., IV, 1849, p. 300; Pr. Ac. N. Sci. 

 Phila., * 1, 1850, p. 275 pi. xxxvn, fig. 1 ; *IV, 1849, p. 152; *VI, 1852, p. 257 

 *P.ETEL, Conch. Sam., Ill, 1890, p. 167. 



Chattahoochee and Flint rivers, Georgia. 



t QUADRULA KLEINIANA Lea.' 



*Pmo kleinianus LEA, Pr. Am. Phil. Soc., V, 1852, p. 251; * Tr. Am. Phil. Soc., 

 X, 1852, p. 265, pi. xvii, fig. 18; * Obs., V, 1852, p. 21, pi. xvn, lig. 18. 



* CONRAD, Pr. Ac. N. Sci. Phila 1 ., VI, 1853, p. 257.* H. and A. ADAMS, Gen. 

 Rec. Moll., II, 1857, p. 498. * REEVE, Conch. Icon., XVI, 1864, pi. n, fig.6. 

 *B. H.WRIGHT, Check List, 1888. * P.KTEL, Conch. Sam., Ill, 1890, p. 156. 



* Margaron (Unio} kleinianus LEA, Syn., 1852, p. 20; 1870, p. 30. 



* Unio sparsus KUSTKR, Conch. Cab. Unio, 1861, p. 252, pi. i.xxxv, fig. 2. 



Southern Georgia; northern Florida. 



Section FTJSCONAIA Simpson, 1900. 

 (Type, Unio trigonus Lea.) 



Shell round, rhomboid, triangular, or short elliptical, with a moderate 

 posterior ridge; beaks high and full, curved inward and forward, sculp- 

 tured with a few coarse, parallel ridges which curve upward behind; 

 epidermis dark; surface not sculptured; hinge plate of moderate width; 

 pseudocardinals strong; nacre white, salmon, or purple. 



Animal having all four gills occupied throughout as a marsupium, 

 filled with pink or purplish ova when gravid; inner gills much the 

 wider in front, free generally from the abdominal sac; outer gills cut 

 away slopiugly in front. 



(Group of Quadrula beadleiana.) 



Shell moderately solid, somewhat triangularly rounded, bluntly 

 pointed and sometimes slightly biangular at post base, with a more 

 or less developed posterior ridge, in front of which it is full; beaks not 



1 A rather smooth infucatua. 



2 In the Proceedings of the U. S. National Museum, XV, 1892, p. 404, I united this 

 species with Unio infucatus Conrad. Further study of additional material and of 

 the animals which show some differences has induced me to separate the two. 



