750 PROCEEDINGS OF THE NATIONAL MUST. I'M VOUXXH. 



tPLEUROBEMA SWORDIANA S.H.Wright. 



* I'nio 8icordianu8 8. H. WRIGHT, Naut., XI, 1897, p. 4. 1 



* Pleurobema swordiana, SIMPSON, Pr. Ac. N. Sci. 1'hila., 1900, p. 81, pi. iv, fig. 4. 



Head waters of the Tennessee River. 



tPLEUROBEMA TUMESCENS Lea. 



* Unio tumevcens LEA, Pr. Am. Phil. Soc., IV, 1845, p. 164; Tr. Am. Phil. Soc., X, 



1848, p. 71, pi. in, fig. 7; Obs., IV, 1848, p. 45, pi. in, fig. 7.* CONRAD, Pr. Ac. 

 N. Sci. Phila.,VI, 1853, p. 259. * H. ami A. AI>AMS, Gen. Rec. Moll., II, 1857, 

 p.496. * B.H.WRIGHT, Check List, 1888. *P.ETEL, Conch. Sam., Ill, 1890, 

 p. 170. 



* Margaron (Unio) .tumescens LEA, Syn., 1852, p. 25; 1870, p. 38. 



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

 VIII, 1874, p. 13, pi. in, fig. 9; *Obs., XIII, 1874, p. 17, pi. in, fig. 9. 

 * B. H. WRIGHT, Check List, 



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

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



tPLEUROBEMA DOLABELLOIDES Lea. 



* Unio dolabeUoides LEA, Pr. Am. Phil. Soc., I, 1840, p. 288; *Tr. Am. Phil. Soc., 



VIII, 1842, p. 215, pi. xv, fig. 31 ; * Obs., Ill, 1842, p. 53, pi. xv, fig. 51. *CON- 



RAD, Pr. Ac. N. Sci. Phila., VI, 1853, p. 248. *H. and A. ADAMS, Gen. Rec. 



Moll., II, 1857, p. 492.* CHENU, 111. Conch., 1858, pi. xxix, figs. 4, 4a, 46. 



*KUSTER, Conch. Cab., 1861, p. 214, pi. LXXI, fig. 3. * SOWKRBY, Conch. 



Icon., XVI, 1866, pi. xxxvn, fig. 205.* B. H. WRIGHT, Check List, 1888. 



*P.KTEL, Conch. Sam., Ill, 1890, p. 151. 



* Margaron ( Unio) dolabelloides 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.ETEL, Conch. Sam., Ill, 1890, p. 169. 

 * Margaron ( Unio) thorntonii LEA, Syn., 1870, p. 56. 

 t * Unio mooresianus LEA, Pr. Ac. N. Sci. Phila., 1, 1857, p. 83 ; Ml. 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 ( Unio) mooresianus LEA, Syn., 1870, p. 39. 

 *Unio moorenianus P.-ETEL, Conch. Sam., Ill, 1890, p. 159. 



t * Unio rccurvatus LEA, Pr. Ac. N. Sci. Phila., 1, 1871, p. 192 ; Ml. Ac. X. Sci. Phila., 



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



WRIGHT, Check List, 1888. 

 }*Unio circumactus LEA/ J Pr. Ac. N. Sci. Phila., I, 1871, p. 192; Ml. 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 River drainage. 



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



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

 same species. 



