NO. 1205. SYNOPSIS OF THE NAIADES SIMPSON. 793 



tQUADRULA EBENUS Lea. 



* Cwio edens LEA, Tr. Am. Phil. Soc.,IV, 1831, p. 84, pi. ix. fig. 14; *Obs., 1, 1834, p. 



94, pi. ix, fig. 14. -CONRAD, New F. W. Shells, 1834, p. 69.* HANLEY, Test. 

 Moll., 1842, p. 202; *Biv. Shells, 1843, p. 202, pi. xx, fig. 47. * CATLOW and 

 REEVE, Conch. Nora., 1845, p. 58. *H. and A. ADAMS, Gen. Eec. Moll., II, 1857, 

 p. 492. *CHENU, 111. Conch., 1858, pi. xv, figs. 7, la, lb. * SOWERBY, Conch. 

 Icon., XVI, 1868, pi. LXVI, fig. 334. *CALKIXS, Pr. Ottawa Acad. Sci., 1874, p. 

 42. *B. H. WRIGHT, Check List, 1888. T.ETEL, Conch. Sain., Ill, 1890, 

 p. 151. 



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

 *Margaron ( Unio) ebenus LEA, Syn., 1852, p. 35; 1870, p. 56. 



* Unio obovalis SAY, Am. Conch., VI, 1834. 



* Unio oWiqiiHs CONRAD, Monog., IX, 1837, p. 77, pi. XLIII, fig. 2.* KusTER,Conch. 



Cab. Unio, 1861, p. 215, pi. LXXI, fig. 4. 



* Unio mytiloides SWAINSON, Treatise on Mai., 1840, p. 270, figa. 52, 53. 



Mississippi drainage generally except its western portion; Alabama 

 and Tombigbee rivers; northeast Texas!. 



tQUADRULA GLOBATA Lea. 



* Unio fjhbatus LEA, Pr. Ac. N. Sci. Phila., I, 1871, p. 191 ; * Jl. Ac. N. Sci. Phila., 



VIII, 1874, p. 5, pi. i, fig. 1 ; * Obs., XIII, 1874, p. 9, pi. i, fig. 1.* B.H. WRIGHT, 

 Check List, 1888. 



Holston and Tennessee rivers, Tennessee; Etowali Eiver, Georgia. 



(Group of Quadrula glandacea. 1 ) 



Shell rhomboid-oval, nearly straight below and slightly biaugulate 

 behind, with a well-delined double posterior ridge; beaks probably 

 full; surface slightly and irregularly sulcate; . epidermis wrinkled, 

 tawny; hinge strong, the plate somewhat flattened; pseudocardiuals 

 triangular; laterals strong, secondary lateral of right valve well devel- 

 oped; beak cavities deep, compressed; muscle scars very deep, smooth; 

 nacre dirty straw color. 



tQUADRULA GLANDACEA Lea. 



*r/nio<7?aw(?acesLEA,Pr. Ac. N. Sci. Phila,, V, 1861, p. 59; Ml. Ac. N. Sci. Phila., 

 V, 1862, p. 77, pi. ix, fig. 226; *0bs., VIII, p. 81, pi. ix, fig. 226.*]$. H. 

 WRIGHT, Check List, 1888. 



* Maryaron ( Unio) glandaceus LEA, Syn., 1870, p. 38. 



Coosa and Cahawba rivers, Alabama. 



>I am somewhat at a loss to know where to place this group. The very limited 

 amount of material I have seen is in a badly eroded condition. I can form no 

 idea of the beak sculpture, and I have never seen the soft parts. The texture and 

 coloring of all the shells I have seen are like those of Pleurobema, but the very 

 deep beak cavities and the general form are like Quadrula. 



