NO. 1205. SVXOl'SIS OF THE NAIADES SIMI'SON. 679 



t MARGARITANA HEMBELI Conrad. 



Inin hembeli CONRAD, Monog., X, 1838, p. 93, pi. LI, iig. 1. * HANLEY, Biv. 

 Shells, 1856, p. 383, pi. xxiv, tig. 3.* H. and A. ADAMS, Gen. Rec. Moll., II, 

 1857, p. 497. * SOWERBY, Couch. Icon., XVI, 1866, pi. xxxm, fig. 172. 

 *B. H. WKIGHT, Check List, 1888. * P^ETKL, Conch. Sam., Ill, 1890, p. 154. 



* Margaron (Unio) hembeli LEA, Syn., 1852, p. 21; 1870, p. 32. 



Louisiana; Burnt Corn, Alabama. 



f MARGARITANA MONODONTA Say. 



I'nio monodonta SAY, N. Harm. Diss., II, 1829, p. 293; * Aui. Couch., I, 1830, 

 pi. vi. SHORT and EATON, Trans. Jl., 1831, p. 79. * CONRAI>, New F. W. 

 Shells, 1834, p. 70. DESHAYKS, An. sans. Vert., 2d ed., VI, 1835, p. 553; 3d 

 ed., II, 1839, p. 674. *CnKNr, Bib. Couch., 1st ser., Ill, 1845, p. 12, pi. n, 

 fig. 1. *CATLOW and REEVE, Conch. Norn., 1845, p. 61. 



* Alasmodonta monodonta FERUSSAC, Gner. Mag., 1835, p. 26. 



* Margaritana monodonta CONHAD, Pr. Ac. N. Sci., Phila. VI, Ifc53, p. 262. 



* Unio monodontus SAY, Am. Conch., VI, 1834. * HANLEY, Test. Moll., 1842, p. 



210; * Biv. Shells, 1843, p. 210, pi. xxm, fig. 48.* H. and A. ADAMS, Gen., 

 Rec. Moll., II, 1857, p. 491. *KUSTKR, Conch. Cab., 1861, p. 221, pi. LXXV, 

 fig. 1. *B. H. WRIGHT, Check List, 1888. * PJETEL, Conch. Sam., Ill, 1890, 

 p. 159. 



* Margarita ( Unio) monodontits LEA, Syn., 1836, p. 40; 1838, p. 26. 



* Margaron ( Unio) monodontus LEA, Syn., 1852, p. 39; 1870, p. 62. 



* Unio soleniformis LEA, Tr. Am. Phil. Soc., LV, 1831, p. 87, pi. x, fig. 17; *Obs., 



I,'1834, p. 97, pi. x, fig. 17. *CHENU, 111. Conch., 1858, pi. xiv, tigs. 4, 4a, 

 4fr; * Manual, II, 1859, p. 137, fig. 661. *SOWERBY, Conch. Icon., XVI, 1866, 

 pi. XLV, fig. 243. 



* Margaritana soleniformis P.ETKL, Conch. Sam., Ill, 1890, p. 173. 



Ohio; Cumberland, and Tennessee river systems; Illinois; eastern 

 Iowa; Nebraska!. 



t MARGARITANA DECUMBENS Lea. 



* Unio decitmbens LEA, Pr. Ac. N. Sci. Phila., V, 1861, p: 40.* LEA, Jl. Ac. N. Sci. 

 Phila., 1862, p. 87. pi. xil, tig. 236. * LEA, Obs., VIII, 1862, p. 91, pl.xii, tig. 

 236. *SOWERBY, Conch. Icon., XVI, 1868, pi. LXXXII, iig. 432. *B. H. 

 WRIGHT, Check List, 1888. 



* Margaron (Unio) decnmbens LEA, Syn., 1870, p. 62. 



Alabama. 



Genus UNIO Retzius, 1788. l 



(Type, Unio tnmidits Retzius.) 



Unio RETZIUS, Diss. Hist. Nov. Test. Gen., 1788, p. 16. BitUGUiERic, Choix de 



Memoirs, 1, 1792, p. 106. 



Limnwa POLI (part), Test. Utr. Sic., 1, 1791, p. 31. 

 Lymnium OKEN, Lehrbuch, 1815, p. 237. 

 Elliptio RAFINESQUE, Jl.de Phys. Nat. Hist., 1819, p. 426. 

 Mysca TURTON, Couch. Ins. Brit., 1822, p. 243. 



'This genus was described in a thesis by Laurentius Miinter Philipsson under 

 his master, Ret/ins, in the University of Lund, Sweden, and it is often credited to 

 the former. I am informed by Professor Job. Chr. Moberg, of Lund, that by a 

 former law or custom of the university the professor was considered the author of 

 all papers which a student under him defended. According to this, Ret/ins must be 

 credited with the genus. This law was repealed in Lund in 1852. 



