710 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxii. 



tUNIO DARIENSIS Lea. 



* Uniodariensis'L^A, Tr. Am. Pliil. 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.—* Conrad, 

 Pr. Ac. N. Sci., Phila., VI, 1853, p. 248.— *H. and A. Adams, Gen. Kec. Moll., II, 

 1857, p. 493.—* CuENU, 111. Conch., 1858, pi. xxxiii, figs. 6, 6a, 6h.—* Sowerby, 

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



* P.ETEL, Conch. Sam., Ill, 1890, p. 150.—* Simpson, Pr. U. S. Nat. Mus., XV, 

 1892, p. 413, pi. Liii, fig. 2 ; Liv, fig. 1. 



* Margaron ( Unio) dariensis Lea, Syn., 1852, p. 33 ; 1870, p. 54. 



Southeast Georgia to north Florida. 



tUNIO MONROENSIS Lea. 



Unio monroensts Lea,i Desc. of 12 sp. of Unioues, 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. 

 Eec Moll., II, 1857, p. 494.— *B. H. Wright, Check List, 1888.— *P^tel, 

 Conch. Sam., Ill, 1890, p. 159.—* Simpson, Pr. LT. S. Nat. Mus., XV, 1892, p. 410, 

 pi. LI, fig. 1. 



* Margaron {Unio) monroensis Lea, Syn., 18l>2, p. 29; 1870, p. 46. 



Florida. 



tUNIO HARTWRIGHTI^ B. H. Wright. 

 t Unio hartwrighti B. H. Wright, Naut., IX, 1896, p. 121, pi. ii, figs. 4-6. 



Lake Beresford, Florida. 



UNIO HINKLEYI B. H. Wright. 



*Unio Mnkleyi B. H. Wright, Pr. Ac N. Sci. Phila., 1888, p. 117, pi. iv, fig. 3^; 

 ^ 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, and straight or curved 

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

 U. hartwrighti. 



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

 in the Check List, by Pietel 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 Avhat 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. 



