NO. 1205. SYNOPSIS OF THE NAIADES— SIMPSON. 759 



tPLEUROBEMA JOHANNIS Lea. 



* ?7wioJo/iawmsLKA, Pr. Ac.N. Sci. PMla.,Iir, 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. 

 WriCxHT, Check List, 1888. 



"^ Margaron (Unio) johannis Lea, Syn., 1870, p. 41. 



Alabama River system. 



t PLEUROBEMA HANLEYANA Lea. 



* Unio Imnleyanus Lea, Tr. Am. Phil'Soc, X, 1852, p. 279, pi. xxiii, fig. 37 ; * Obs., 



V, 1852, p. 35, pi. xxiii, fig. 37.—* H. aud A. Adams, Gen. Eec. Moll., II, 

 1857, p. 495. — * Reeve, Conch. Icon., XVI, 1864, pi. xvii, fig. 76.'-" Sowerby, 

 Conch. Icon., XVI, 1866, pi. xlvi, fig. 249.— * B. H. Wright, Check List, 

 1888.— -^ PiETEL, Conch. Sam., Ill, 1890, p. 154. 



*Margaron {Unio) hanleyanus Lea, Syn., 1852, p. 26; 1870, p. 40. 



Coosa Eiver drainage, Georgia and Alabama. 



tPLEUROBEMA FLAVIDULUS Lea. 



* Unio flavidulus Lea, Pr. Ac. N. Sci. Phila., V, 1861, p. 39 ; * Jl. Ac. N. Sci. Phila., 



V, 1862, p. 97, pi. XV, fig. 245; *0b8., VIII, 1862, p. 101, pi. xv, fig. 245.— *B. 

 H. Wright, Check List, 1888. 



* Mar gar on ( Unio) flavidulus Lea, Syn., 1870, p. 40. 



Columbus, Mississippi. 



(Group of Pleurohema hulhosa.) 



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 hulbosus 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. 



* Marguron ( Unio) hulbosus 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. 



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



Altamaha and Flint risers, Georgia; Suwanee Eiver, Florida.^ 



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

 fairly well with the type of that species. 

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



