NO. ia5. SYNOPSIS OF THE NA FADES SIM I'SON. 7Q7 



Gen. Rec. Moll., II, 1857, p. 495.* CALKINS, Pr. Ot. Ac. Sci., 1874, p. 42. 



* 15. 1 1. WRIGHT, Check List, 1888.* P.ETEL, Conch. Sam., Ill, 1890, p. 149. 



* CALL, Tr. Ac. Sci., St. Lonis, VII, 1895, p. 12, pi. n. 



* Margarita ( Unio)- crassidens LEA, Syn., 1836, p. 19; 1838, p. 17. 

 *Margaron ( Unio} crassidens LEA, Syn., 1852, p. 24; 1870, p. 37. 

 .' f'nin iiiijra RAFINESQUE, Ann. Geu. Sci. Brux., V, 1820, p. 291, pi. LXXX, figs. 1-4. 



* Unio ni<jer SAY, Am. Conch., VI, 1834. * CONRAD, Ne\v F. W. Shells, 1834, p. 70. 



* FERUSSAC, Guer. Mag., 1835, p. 27. * CONRAD, Monog., VI, 1836, p. 49, pi. 

 x \ vi. * KUSTER, Conch. Cab. Unio, 1852, p. 25, pi. iv, fig. 1. * AGASSIZ, Arch, 

 fiir Naturg., I, 1852, p. 50. * CONRAD, Pr. Acacl. N. Sci , Phila., VI, 1853, p. 

 253.* SOWERBY, Conch. Icon., XVI, 1868, pi. LXXVIII, fig. 408. 



.' I'nio cuneatiis BARNES, Am. Jl. Sci., VI, 1823, p. 263.* HILDRETH, Am. Jl. 

 Sci., XIV, 1828, p. 279, fig. 3.* SHORT and EATON, Transylvania Jl., 1831, 

 p. 78. 



* Mya cuneata EATON, Zool. Text Book, 1826, p. 220. 



*f Unio discus SOWERBY, Conch. Icon., XVI, 1868, pi. LXII, fig. 310. 



* Unio crassus SOWERBY, Conch. Icon., XVI, 1868, pi. xcv, fig. 520. 



Mississippi drainage generally; Alabama and Tombigbee rivers; 

 southeast to the Chattahoochee River. In the southeastern part of 

 its range this species seems to merge into U, incrassatus. 



tUNIO INCRASSATUS Lea. 1 



* Unio incrassatus LEA, Pr. Am. Phil. Soc., 1, 1840, p. 286 ; * Tr. Am. Phil. Soc.,VIII, 



1840, p. 217, pi. xvi, fig. 34 ; * Obs., Ill, 1842, p. 55, pi. xvi, fig. 34.* H. and 

 A. ADAMS, Gen. Rec. Moll., II, 1857, p. 495. * CHENU, 111. Conch., 1858, pi. 

 xxx, figs. 5, 5a, 5b. * KUSTER, Conch. Cab. Unio, 1861, p. 192, pi. LX, fig. 5. 



* REEVE, Conch. Icon., XVI, 1865, pi. xxvi, fig. 127. *B. H. WRIGHT, 

 Check List, 1888. *P^TEL, Conch. Sam., Ill, 1890, p. 155. 



*Margaron ( Unio) incrassatus LEA, Syn., 1852, p. 24; 1870, p. 37. 



Coosa River system; Chattahoochee and rivers of north Florida; 

 east to Savannah ! 



tUNIO POLYMORPHUS B. H. Wright. 



* Unio polymorphus B. H. WRIGHT, Naut., XIII, 1899, p. 42. 

 Spanish Creek, Charlton County, Georgia. 



fUNIO FORBESIANUS Lea. 



* Unio forbesianus LEA, Pr. Am. Phil. Soc., V, 1852, p. 251; *Tr. Am. Phil. Soc., 



X, 1852, p. 264, pi. xvi, fig. 17 ; * Obs., V, 1852, p. 20, pi. xvi, fig. 17.* CONRAD, 

 Pr. Acad. Nat. Sci. Phila., VI, 1853, p. 249. *H. and A. ADAMS, Gen. Rec. 

 Moll., II, 1857, p. 495. * KUSTER, Conch. Cab. Unio, 1861, p. 310, pi. LXIX, 

 fig. 6. *MUSGRAVE, Phot. Conch., 1863, pi. n, fig. 2. * SOWERBY, Conch. 

 Icon., XVI, 1868, pi. LXXI, fig. 361. *B. H. WRIGHT, Check List, 1888. 



* SIMPSON, Pr. U. S. Nat. Mns., XV, 1892, p. 410, pi. XLIX, fig. 3; L, figs. 2, 3. 

 *Margaron (Unio) forbesianus LEA, Syn., 1852, p. 24; 1870, p. 37. 



*\Unio moussonianus LEA, Tr. Am. Phil. Soc., X, 1852, p. 268, pi. xvm, fig. 22; 

 *0bs., V, 1852, p. 24, pi. xvm, fig. 22. * CONRAD, Pr. Acad. N. Sci. Phila., 

 VI, 1853, p. 252. *H. and A. ADAMS, Gen. Rec. Moll., II, 1857, p. 494. 

 *B. H. WEIGHT, Check List, 1888. * P^ETEL, Conch. Sam., Ill, 1890, p. 160. 



* Margaron (Unio) moussonianus LEA, Syu., 1852, p. 29; 1870, p. 46. 



1 1 am doubtful whether this is more than a small, rhomboid, southeastern variety 

 of crassidens, bearing the same relation to it that U. subgibbosus does to U. gibbosus. 



