XYXOPSIS OF THE NAIADES SIMPSON. 715 



VI, 1866 ? p. 18, pi. v, fig. 16; Obs., XI, 1867, p. 22, pi. v, fig. 16.* B. H. WRIGHT, 

 Check List, 1888. 



* Margaron ( Unio) perJiicena LEA, Syn., 1K70, p. 45. 



Korth Carolina to South Georgia and Florida. 

 tUNIO PYGMiEUS Lea. 1 



* Unio pygma-us LEA, Pr. Am. Phil. Soc., V, 1852, p. 252; * Tr. Am. Phil. Soc., X, 



1852, p. 262, pi. xv, fig. 14; * Obs., V, 1852, p. 18, pi. xv, fig. 14; * CONRAD, 

 Pr. Ac. N. Sci. Phila., VI, 1853, p. 256.* B. H. WRIGHT, Check List, 1888. 



* Margaron ( Unio) pygmceus LEA, Syn., 1870, p. 48. 



Abbeville District, South Carolina. 



tUNIO LEHMANII, S. H. Wright. 



* Unio lehmanii, S. H. WRIGHT, Naut., X, 1897, p. 138.* SIMPSON, Pr. Acad. N. 



Sci. Phila., 1900, p. 80, pi. iv, fig. 9. 



St. Marys River, Florida. 



tUNIO BURTCHIANUS S. H. Wright. 



* Unio burtchianus S. H. WRIGHT, Naut., X, 1897, p. 137. * SIMPSON, Pr. Ac. N. Sci. 



Phila., 1900, p. 80, pi. iv, fig. 8. 



St. Mary's River, Florida. 



tUNIO CONFERTUS Lea.* 



* Unio lugubris LEA, Tr. Am. Phil. Soc., VI, 1834, p. 30, pi. ix, fig. 25 ; * Ohs., II, 1838, 



p. 30, pi. ix, fig. 25. * TROSCHEL, Arch, fur Naturg.,V, 1839, Pt. 2, p. 235. 

 HANLEY, Test. Moll., 1842, p. 206; *Biv. Shells, 1843, p. 206, pi. xxn, fig. 9. 

 *CHENU, Bib. Conch., 1st ser., Ill, 1845, p. 53, pi. xv, figs. 1, la. * CATLOW and 

 REEVE, Conch. Nom., 1845, p. 60. * CONRAD, Pr. Ac. N. Sci. Phila., VI, 1853, 

 p.252. *H. and A. ADAMS. Gen. Rec. Moll., II, 1857, p. 491. *CHENU, 111. 

 Conch., 1858, pi. xx, figs. 3, 3a, 36.* SOWERBY, Conch. Icon., XVI, 1868, 

 pi. LXXX, fig. 423. * B. H. WRIGHT, Check List, 1888.* P.ETEL, Conch. Sam., 

 Ill, 1890, p. 158. * SIMPSON, Pr. U. S. Nat. Mus., XV, 1892, p. 424, pi. LXVI, 

 fig. 4 ; LXVII, fig. 1. 



* Margarita (Unio) lugubris LEA, Syn., 1836, p. 37; 1838, p. 24. 



* Margaron ( Unio) lugubris LEA, Syn., 1852, p. 38; 1870, p. 53. 



* t Unio confertus LEA, Tr. Am. Phil. Soc., V, 1834, p. 103, pi. x vi, fig. 47 ; * Obs., I, 



p. 215, pi. xvi, fig. 47. * FERUSSAC, Guer. Mag., 1835, p. 29. * HANLEY, Test. 

 Moll., 1842, p. 200 ; * Biv. Shells, 1843, p. 200, pi. xxm, fig. 34.* CATLOW and 

 REEVE, Conch. Nom., 1845, p. 57. *H. and A. ADAMS, Gen. Rec. Moll., II, 

 1857, p. 493.* SOWERBY, Conch. Icon., XVI, 1866, pi. xxxv, fig. 185.* B. H. 

 WRIGHT, Check List, 1888.* P.ETEL, Conch. Sam., Ill, 1890, p. 148. 



* Margarita ( Unio) confertus LEA, Syn., 1836, p. 31 ; 1838, p. 22. 



* Margaron ( Unio) confertus LEA, Syn., 1852, p. 33; 1870, p. 53. 



* t Unio geddingsianus LEA, Pr. Am. Phil. Soc. 1, 1840, p. 285 ; * Tr. Am. Phil. Soc., 



VIII. 1842, p. 202, pi. xi, fig. 15 ; * Obs., Ill, 1842, p. 40, pl.xi, fig. 15." CONRAD, 

 Pr. Ac. N. Sci. Phila., VI, 1853, p. 250.* H. and A. ADAMS, Gen. Rec. Moll., II, 

 1857, p. 493. * CHENU, 111. Conch., 1858, pi. xxxi, figs. 3, 3a, 3&. * B. H. 

 WRIGHT, Check List, 1888.* P^ETEL, Conch. Sam., Ill, 1890, p. 153. 



* Margaron ( Unio) geddingsianus LEA, Syn., 1852, p. 33; 1870, p. 53. 



1 Only a single broken right valve of this is in the Lea collection. 



2 The name lugubris applied first to this species will have to give way to confertus 

 because Say used lugubris at an earlier date for a Unio. 



