750 PROCEEDINGS OF THE NATIONAL MUSEUM^ vol.xxii. 



fPLEUROBEMA SWORDIANA S.H.Wright. 



* TJnio sicordianiis S. H. Wright, Naut., XI, 1897, p. 4.^ 



* Pleurohema sioordiana, Simpson, Pr. Ac. N. Sci. Phila., 1900, p. 81, pi. iv, fig. 4. 



Head waters of the Tennessee Eiver. 



t PLEUROBEMA TUMESCENS Lea. 



* TJnio tumeccens Lea, Pr. Am. Phil. Soc, IV, 1845, p. 164; Tr. Am. Phil. Soc, X, 



1848, p. 71, pi. Ill, fig. 7 ; Obs., IV, 1848, p. 45, pi. in, fig. 7.—^ Cokrad, Pr. Ac. 



N. Sci. Phila.,VI, 1853, p. 259.—* H. and A. Adams, Gen. Eec. Moll., II, 1857, 



p_496._*B. H.Wright, Check List, 1888.— * P^tel, Conch. Sam., Ill, 1890, 



p. 170. 

 * Margaron {TJnio) tumescens Lea, Syn., 1852, p. 25; 1870, p. 38. 

 t * Unio radiosus Lea, Pr. Ac. N. Sci. Phila., I, 1871, p. 192; * Jl. Ac. N. Sci. Phila., 



VIII, 1874, p. 13, pi. Ill, fig. 9; *0b8., XIII, 1874, p. 17, pi. in, fig. 9.— 



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



Tennessee. The localities, Alexandria, Louisiana, of Lea, for the type, 

 and Ouachita Eiver, Arkansas, given by Call, are open to doubt. 



t PLEUROBEMA DOLABELLOIDES Lea. 



* Unio dolabelloides Lea, Pr. Am. Phil. Soc, I, 1840, p. 288; *Tr. Am. Phil. Soc, 



VIII, 1842, p. 215, pi. XV, fig. 31; *0b8.. Ill, 1842, p. 53, pi. xv, fig. 51.— *CoN- 



RAD, Pr. Ac. N. Sci. Phila., VI, 1853, p.248.— *H. and A. Adams, Gen. Eec. 



Moll., II, 1857, p. 492.—* Chenu, 111. Conch., 1858, pi. xxix, figs. 4, 4a, 4&.— 



*Kuster, Conch. Cab., 1861, p. 214, pi. lxxi, fig. 3.— * Soaverby, Conch. 



Icon., XVI, 1866, pi. xxxvii, fig. 205.—* B. IL Wright, Check List, 1888.— 



*PiETEL, Conch. Sam., Ill, 1890, p. 151. 

 *Margaron ( TJnio) dolaielloides Lea, Syn,, 1852, p. 35 ; 1870, p. 56. 

 t * Unio thorntonii, Lea, Pr. Ac. N. Sci. Phila., 1, 1857, p. 83;- *J1. Ac. N. Sci. Phila., 



VI, 1866, p. 38, pi. XIV, fig. 36; * Obs., XI, 1867, p. 42, pi. xiv, fig. 36.— *B. H. 



Wright, Check List, 1888.— *P^tel, Conch. Sam., Ill, 1890, p. 169. 

 ''Margaron ( TJnio) thorntonii Lea, Syn., 1870, p. 56. 

 t * TJnio mooresianus Lea, Pr. Ac. N. Sci. Phila., 1, 1857, p. 83 ; * Jl. Ac. N. Sci. Phila., 



VI, 1866, p. 39, pi. XIV, fig. 37; *Obs., XI, 1867, p. 43, pi. xiv, fig. 37.— *B. H. 



Wright, Check List, 1888. 



* Margaron ( TJnio) mooresianus Lea, Syn., 1870, p. 39. 



* TJnio moorenianus PyEtel, Conch. Sam., Ill, 1890, p. 159. 



t * Unio recurvatus Lea, Pr. Ac. N. Sci. Phila., 1, 1871, p. 192; *.]1. Ac. N. Sci. Phila., 



VIII, 1874, p. 10, pi. II, fig. 6; * Obs., XIII, 1874, p. 14, pi. ii, fig. 6.— * B. H. 



Wright, Check List, 1888. 

 i*Unio circumactus Lea,* Pr. Ac. N. Sci. Phila., I, 1871, p. 192; *JI. Ac. N. Sci. 



Phila., VIII, 1874, pi. IV, fig. 11 ; Obs., XIII, 1874, p. 19, pi. iv, fig. 11.—* B. H. 



Wright, Check List, 1888. 



Tennessee Eiver drainage. 



1 1 am a little in doubt as to the validity of this species. 



-The figured type is certainly an adult, and that oi dolabelloides the young of the 

 same species. 



