NO. 1205. SYNOPSIS OF THE NAIADES SIMPSON. 759 



tPLEUROBEMA JOHANNIS Lea. 



* Unio johannis IMA, Pr. Ac.N. Sci. Phila.,111, 1859, p. 171; *J1. Ac. N. Sci. Phila., 



IV, 1860, p. 340, pi. LV, fig. 168 ; * Obs.,, VIII, 1860, p. 25, pi. LV, fig. 168.* B. H. 

 WRIGHT, Check List, 1888. 



* Mar gar on ( Unio) joliannls LEA, Syn., 1870, p. 41. 



Alabama River system. 



f PLEUROBEMA HANLEYANA Lea. 



* Unio nanleyanus LEA, Tr. Am. Phil. Soc., X, 1852, p. 279, pi. xxin, fig. 37; * Obs., 



V, 1852, p. 35, pi. xxm, fig. 37.* H. and A. ADAMS, Gen. Eec. Moll., II, 

 1857, p. 495.* REEVE, Conch. Icon., XVI, 1864, pi. xvn, fig. 76.'* SOWERBY, 

 Conch. Icon., XVI, 1866, pi. XLVI, fig. 249. * B. H. WRIGHT, Check List, 

 1888. * P^ETEL, Conch. Sam., Ill, 1890, p. 154. 



* Margaron (Unio) Nanleyanus LEA, Syn., 1852, p. 26; 1870, p. 40. 



Coosa River drainage, Georgia and Alabama. 



tPLEUROBEMA FLAVIDULUS Lea. 



* Unio flavidulus LEA, Pr. Ac. N. Sci. Phila., V, 1861, p. 39; *J1. Ac. N. Sci. Phila., 



V, 1862, p. 97, pi. xv, fig. 245; *Obs., VIII, 1862, p. 101,pl. xv,fig. 245. *B. 

 H. WRIGHT, Check List, 1888. 



* Margaron ( Unio) flavidulus LEA, Syn., 1870, p. 40. 



Columbus, Mississippi. 



(Group of Pleurobema bulbosa.) 



Shell elongate oval, solid, inflated, with a high posterior ridge, ending 

 in a point behind, above which it is feebly wrinkled ; beaks full, sculpture 

 not seen; epidermis smooth, dark, rayless; hinge strong; pseudocar- 

 dinals heavy, torn, sometimes a small third one in the left valve; later- 

 als heavy, club-shaped, granulate, two in the left valve and one and a 

 small secondary lateral in the right. Animal unknown. 



tPLEUROBEMA BULBOSA Lea. 



* Unio bulbosus LEA, Pr. Ac. N. Sci. Phila., IX, 1857, p. 172 ; * Jl. Ac. N. Sci. Phila., 



IV, 1859, p. 191, pi. xxi, fig. 75 ; * Obs., VII, 1859, p. 9, pi. xxi, fig. 75.* B. H. 

 WRIGHT, Check List, 1888. 



* Margaron ( Unio) lulbosus LEA, Syn., 1870, p. 40. 



Ocmulgee and Flint rivers, Georgia. 



tPLEUROBEMA HARPERI B. H. Wright. 



* Unio harperi B. H. WRIGHT, Naut., XIII, 1899, p. 6. 



* Pleurobema harperi SIMPSON, Pr. Ac. N. Sci. Phila., 1900, p. 81, pi. i, fig. 10. 



Altamaha and Flint rivers, Georgia ; Su wanee River, Florida. 2 



1 Reeve states in his errata that this is not Unio hanleyanua. The figure agrees 

 fairly well with the type of that species. 



2 This may prove to be a variety of P. bulboaa. 



