784 PROCEEDINGS OF THE_ NATIONAL MUSEUM. vol.xxii. 



t QUADRULA INFUCATA Conrad. 



* Unio infucatus Conrad, New F. W. Shells, 1834, j). 45, pi: iii, fig. 2, p. 70. — * Mol- 



LER, Syn. Nov. Gen., 1836, p. 208. — * Ferussac, Guer. Mag., 1835, p. 29. — 



* Hanley, Test. Moll., 1842, p. 203 ; * Biv. Shells, 1843, p. 203.—* Chenu, Bib. 

 Conch., 1st ser., Ill, 1845, p. 22, pi. ii. fig. 6.—* Catlow and Reeve, Conch. 

 Nom., 1845, p. 60.—* Conrad, Pr. Ac. N. Sci. Phila., VI, 1853, p. 250.—* H. and 

 A. Adams, Gen. Rec. Moll., II, 1857, p. 497.—* Kuster, Conch. Cab. Unio, 1861, 

 p. 176, pi. 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 securiforniis Conrad, 'Ann. and Mag., IV, 1849, p. 300; Pr. Ac. N. Sci. 

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

 *P^TEL, Conch. Sam., til, 1890, p. 167. 



Chattahoochee and Flint rivers, Georgia. 



t QUADRULA KLEINIANA Lea.^ 



*Unio Meinianus 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. xvii, fig. 18.— 



* Conrad, Pr. Ac. N. Sci. Phila., VI, 1853, p. 257.— * H. and A. Adams, Gen. 

 Rec. Moll., II, 1857, p. 498.—* Reeve, Conch. Icon., XVI, 1864, pi. ii, fig. 6.— 

 *B. H.Wright, Check List, 1888.— * P.etel, Conch. Sam., Ill, 1890, p. 156. 



* Margaron {Unio) Meinianus Lea, Syn., 1852, p. 20; 1870, p. 30. 



* Unio sparsus Kuster, Conch. Cab. Unio, 1861, p. 252, pi. lxxxv, 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 wbeu gravid; inner gills mucli the 

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

 away slopingly in front. 



(Group of Quadrula headleiana.) 



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 infucatus. 



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 difl^erences has induced me to separate the two. 



