554 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxii. 



Sci. Phila., VI, 1853, p. 247.—* H. and A. Adams, Gen. Rec. Moll., II, 1857, 

 p. 493. — * Chenu, 111. Conch., 1858, pi. xxiv, figs. 1, la, lb. — * Sowerby, 

 Couch. Icon., XVI, 1866, pi. xxxvi, fig. 197.—'* B. H. Wright, Check List, 

 1888.—* P.ETEL, Couch. Sam., Ill, 1890, p. 149. 



* Margaron ( Unio) cumberhindicus Lea, Syn., 1870, p. 48. 



t * Unio notatus LEA,Tr. Am. Phil. Soc.,VI, 1838, p. 28, pl.viil, fig.22 ; * Obs., II, 1838, 

 p. 28, pi. VIII, fig. 22.— *Troschel, Arch, flir Nat., V, 1839, Pt. 2, p. 235.— 



* Hanley, Test. Moll., 1842, p. 193 ; * Biv. Shells, 1843, p. 193, pi. xxiii, fig. 9.— 



* Catlow and Reeve, Conch. Nom., 1845, p. 61. — " H. and A. Adams, Gen. Rec. 

 Moll., II, 1857, p. 494.— *Chenu, 111. Conch., 1858, pi. xxi, figs, 3, 3a, Sh.— 



* B. H. Wright, Check List, 1888.— *P.etel, Conch. Sam., Ill, 1890, p. 161. 



* Margarita ( Unio) notatus Lea, Syn., 1836, p. 26; 1838, p. 19. 



* Margaron (Unio) notatus Lea, Syn., 1852, p. 29; 1870, p. 45. 



t* Unio glaber Lea, Tr. Am. Phil. Soc, VI, 1838, p. 34, pLx,fig. 29; *Obs., II, 

 1838, p. 34, pi. X, fig. 29.—* Troschel, Arch. fiir. Naturg., V, 1839, Pt. 2, p. 

 236.—- Hanley, Test. Moll., 1842, p. 196; *Biv. Moll., 1843, p. 196, pi. xxiii, 

 fig. 2. — * Catlow and Reeve, Conch. Nom., 1845, p. 59. — * Conrad, Pr. Ac. 

 N. Sci., Phila., VI, 1853, p. 250.— *H. and A. Adams, Gen. Rec. Moll., II, 1857, 

 p. 494. — *Chenu, 111. Conch., 1858, pi. xxiv, figs. 3, 3a, 36. — * Sowerby, 

 Conch. Icon., XVI, 1868, pi. lxxxv, fig. 452.—* B. H. Wright, Check List, 

 1888.— * PvEtel, Conch. Sam., 111,1890, p. 153. 



* Margarita ( Unio) glaber Lea, Syn., 1836, p. 28; 1838, p. 20. 



* Margaron ( Unio) glaber Lea, Syn., 1852, p. 31; 1870, p. 48. 



* Unio radians Lea, Pr. Ac. N. Sci. Phila., IX, 1857, p. 32 ; * Jl. Ac. N. Sci. Phila., 



IV, 1859, p. 201, pi. XXIII, fig. 84; *Obs., VII, 1859, p. 19, pi. xxiii, fig. 84.— 



* B. H. Wright, Check List, 1888. 



* Margaron {Unio) radians Lea, Syn., 1870, p. 46. 



t* Uniojonesii Lea, Pr. Ac. N. Sci. Phila., Ill, 1859, p. 171; * Jl. Ac. N. Sci. Phila., 

 IV, 1860, p. 339, pi. Liv, fig. 164; *Obs., VIII, 1860, p. 21, pi. liv, fig. 164.— 



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



* Margaron {Unio) jonesiilJEA, Syn., 1870, p. 48. 



t * Unio discrepans Lea, Pr. Ac. N. Sci. Phila., IV, 1860, p. 92; * Jl. Ac. N. Sci. 



Phila., IV, 1860,p. 340, pi. lv, fig. 165; *Obs., VIII, 1860, p. 22, pi. lv, fig. 



165.— * Sowerby, Conch. Icon., XVI, 1866, pi. xxxiv, fig. 176.— * B. H. 



Wright, Check List, 1888.—* P.etel, Conch. Sam., Ill, 1890, p. 151. 

 'Margaron (Unio) discrepans Lea, Syn., 1870, p. 48. 

 t * U7iio scitnlus Lea, Pr. Ac. N. Sci. Phila., IV, 1860, p. 93; * Jl. Ac. N. Sci. Phila., 



IV, 1860, p. 342, pi. LV, fig. 167; * Obs., VIII, 1860, p. 24, pi. lv, fig. 167.—* B. 



H. Wright, Check List, 1888. 



* Margaron ( Unio) scitulus Lea, Syn., 1870, p. 45. 



t * Unio lingimformis Lea, Pr. Ac. N. Sci. Phila., IV, 1860, p. 305; * Jl. Ac. N. Sci. 

 Phila., IV, 1860, p. 345, pi. lvi, fig. 170; * Obs., VIII, I860, p. 27, pi. LVi, 

 fig. 170.— *B. H. Wright, Check List, 1888. 



* Margaron { Unio) Unguceformis Lea, Syn., 1870, p. 48. 



t * Unio perpictm Lea, Pr. Ac. N. Sci. Phila., IV, 1860, p. 306; * Jl. Ac. N. Sci. 

 Phila., IV, 1860, p. 350, pi. lviii, fig. 175; *Obs., VIII, 1860, p. 32, i.l. 

 LViii, fig. 175; *B. H. Wright, Check List, 1888. 



* Margaron {Unio) perpiotus Lea, Syn., 1870, p. 44. 



\*Unio difficilis Lea,' Pr. Ac. N. Sci. Phila., XII, 1868, p. 144; * Jl. Ac. N. Sci. 



Phila., VI, 1869, p. 311, pi. xlix, fig. 124; *Obs., XII, 1869, p. 71, pi. xlix, 



fig. 124=—* B. H. Wright, Check List, 1888. 

 ■^Margaron {Unio) difficilis Lea, Syn., 1870, p. 46. 



'Two shells are in the Lea collection; one adult and badly worn, the other young, 

 I believe it to be only a form of nebulosns. 



