NO. 1205. SYNOPSIS 01- /7//: \. If, IDES SIMPSON. 787 



tQUADRULA CERINA Conrad. 



*Unio cerinus CONRAD, Mouog., XI, 1838, p. 95, pi. LII; *Pr. Ac. N. Sci. Phila., 

 VI, 1853, p. 246.* SOWERBY, Conch. Icon., XVI, 1868,. pi. LXXXVII, fig. 468. 



* B. H. WRIGHT, Check List, 1888.* P.ETEL, Couch. Sam., Ill, 1890, p. 147. 



Louisiana; eastern Texas ; Mississippi; Alabama; north to Arkansas. 



tQUADRULA HEBETATA Conrad. 



* Unio Jtebctatus CONRAD, * Jl. Ac. N. Sci. Phila., II, 1854, p. 296, pi. xxvi, fig. 5. 



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

 *Margaron ( Unio) habetatus LEA, Syn., 1870, p. 38. 



Missouri ; Tuscaloosa River, Alabama. 



tQUADRULA RUBIDA Lea. 



*rnio ntbidiis LEA, Pr. Ac. N. Sci. Phila., V, 1861, p. 40; * Jl. Ac. N. Sci. Phila., 

 V,1862, p. 95, pi. xiv, fig. 244; * Obs., VIII, 1862, p. 99, pi. xiv, fig. 244. 



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

 *Margaron ( Unio) rnbidus LEA, Syn., 1870, p. 35. 



t * Unio negatus LEA, Pr. Ac. N. Sci. Phila., V, 1861, p. 59; * Jl. Ac. N. Sci. Phila., 

 V, 1862, p. 76, pi. ix, fig. 225; Obs., VIII, 1862, p. 80, pl.ix, fig. 225. * SOW- 

 ERBY, Conch. Icon., XVI, 1866, pi. xxxn, fig. 165.* B. H. WRIGHT, Check 

 List, 1888. *P.ETEL, Conch. Sam., Ill, 1890, p. 160. 



* Margaron ( Unio) neyatus LEA, Syn., 1870, p. 35. 



Streams flowing into the Gulf of Mexico from Alabama to Louisiana. 

 The shell reported under the name Unio negatus, from Kansas, is prob- 

 ably a somewhat sulcate rubiginosus. 



tQUADRULA CHUNII Lea. 



Unio chunii LEA, Pr. Ac. N. Sci. Phila., V, 1861, p. 392; * Jl. Ac. N. Sci. Phila., 

 V, 1862, p. 196, pi. xxvn, p. 265; *Obs., IX, 1863, p. 18, pi. xxvii, fig. 265. 



* B. H. WRIGHT, Check List, 1888.* P.ETEL, III, 1890, p. 148. 



* Margaron ( Unio) chunii LEA, Syn., 1870, p. 38. 



Mississippi; west to central Texas north to Arkansas. 



tQUADRULA RIDDELLII Lea. 



* Unio riddellii LEA, Pr. Ac. N. Sci. Phila., V, 1861, p. 392; * Jl. Ac. N. Sci. Phila., 



V, 1862, p. 198, pi. xxvii, fig. 267; * Obs., IX, 1863, p. 20, pi. xxvn, fig. 267. 



* SOWERBY, Couch. Icon., XVI, 1868, pi. LXXXIII, fig. 442. *B. H.WRIGHT, 

 Check List, 1888.* P^ETEL, Conch. Sam., Ill, 1890, p. 165. 



* Margaron ( Unio) riddellii LEA, Syn., 1870, p. 38. 



Dallas, Texas. 



t QUADRULA FRIERSONI B. H. Wright. 



* Unio friersoni B. H.WRIGHT, Nautilus, IX, 1896, p. 134, pi. in. 

 Louisiana; eastern Texas. 



tQUADRULA TRIGONA Lea. 



* Unio trigonus, LEA, Tr. Am. Phil. Soc., IV, 1831, p. 110, pi. xvi, fig. 40; * Obs., I, 



1834, p. 120, pi. xvi, fig. 40. * HANLEY, Test. Moll., 1842, p. 185; * Biv. Shells, 

 1843, p. 185, pi. xxi, fig. 6.* CATLOW and KEEVE, Conch. Norn., 1845, p. 64. 

 *COXRAD, Pr. Ac. N. Sci. Phila., VI, 1853, p. 258.' H. and A. ADAMS, Gen. Kec. 

 Moll., II, 1857, p. 496." CHEXU, 111. Couch., 1858, pi. xvi, figs. 7, la, 7ft. 



