710 I'l.'OCEEDTNGS OF Till. "NATIONAL M I'SEUM. 



t UNIO DARIENSIS Lea. 



* Unio darien sis LEA, Tr. Am. Phil. Soc., VIII, 1842, p. 246, pi. xxvi, fig. 61 ; * Pr. Am. 



Phil. Soc., II, 1843, p. 225; * Obs., Ill, 1842, p. 84, pi. xxvi, fig. 61. * CONKAD. 

 Pr. Ac. X. Sci., Phila., VI, 1853, p. 248. 'H. and A. ADAMS, Gen. Kec. Moll., 11, 

 1857, p. 493. *CiiKNC, 111. Conch., 1858, pi. xxxm, figs. 6, Ca, 66. * SOWERBY, 

 Conch. Icon., XVI, 1868, pi. xci, fig. 494.* B. H. WHIGHT, Check List, 1888. 



* P.ETEL, Conch. Sara., Ill, 1890, p. 150.* SIMPSON, Pr. U. S. Nat. Mus., XV, 

 1892, p. 413, pi. LIII, fig. 2; LIV, fig. 1. 



* Margaron ( I'nio) dariensis LEA, Syn., 1852, p. 33 ; 1870, p. 54. 



Southeast Georgia to iiorth Florida. 



t UNIO MONROENSIS Lea. 



Unio monroensis LEA, 1 Desc. of 12 sp. of Uniones, 1843, no pagination ; * Tr. Am. 

 Phil. Soc., IX, 1845?, p. 279, pi. XLI, fig. 8; * Obs., IV, 1848, p. 37, pi. XLI, fig. 8. 



* CONRAD, Pr. Ac. N. Sci. Phila., VI, 1853, p. 252. * H. and A. ADAMS, Gen. 

 Rec. Moll., II, 1857, p. 494. *B. H. WRIGHT, Check List, 1888. *P.KTKL, 

 Conch. Sam., Ill, 1890, p. 159. * SIMPSON, Pr. U. S. Nat. Mus., XV, 1892, p. 410, 

 pi. LI, fig. 1. 



*Margaron ( Unio) monroensla LEA, Syn., 18i'-2, p. 29; 1870, p. 46. 



Florida. 



tUNIO HARTWRIGHTI; B. H. Wright. 



t Unio hartwrighti B. H. WRIGHT, Naut., IX, 1896, p. 121, pi. n, tigs. 4-6. 

 Lake Beresford, Florida. 



UNIO HINKLEYI B. H. Wright. 



*Unio hinkleyi B. H. WRIGHT, Pr. Ac. N. Sci. Phila., 1888, p. 117, pi. iv, fig. 3 s ; 

 *Check List, 1888.* SIMPSON, Pr. U. S. Nat. Mus., XV, 1892, p. 423, pi. LXV, 

 fig. 4. 



Florida. 



1 A puzzling form. The type, the only shell in the Lea collection, is rather solid, 

 and the posterior ridge is curved slightly upward in the middle. Other specimens 

 in the museum are less solid, the posterior ridge is sharper, aud straight or curved 

 down in the middle, and there seems to be almost a connection with the very different 

 I', hartwrighti. 



2 This name was applied to another species by Newcomb, and was used by Wright 

 in the Check List, by Pa;tel and others, but the form to which it was given was 

 believed to be a synonym of something else, and it was never described. Mr. 

 Wright has again used the name for what is probably a valid species. 



:> The figure of this shell is not at all accurate, being considerably more blunt 

 posteriorly and inflated below than the specimen sent as the type. It approaches 

 U. monroensis, but is more elongated, and a series of specimens sent by Mr. Wright 

 almost connects it with U. dorei. 



