NO. 1205. SY^'OPSIS OF THE A'AIADES— SIMPSON. 679 



t MARGARITANA HEMBELI Conrad. 



* Unto heinbeU Conkad, Monog., X, 1838, p. 93, pi. Li, tig. 1. — * Hanley, Biv. 



Shells, 1856, p. 383, pi. xxiv, fig. 3. — * H. and A. Adams, Gen. Eec. Moll., II, 

 1857, p. 497.— * SOWKRHY, Conch. Icon., XYI, 1866, pi. xxxiii, fig. 172.— 

 *B. H. WiUGHT, Check List, 1888.— * P^etkl, Conch. Sam., Ill, 1890, p. 154. 



* Margaron (Unio) heviheli Lka, Syn., 1852, p. 21; 1870, p. 32. 



Louisiana; Burnt Corn, Alabama. 



t MARGARITANA MONODONTA Say. 



Unio monodonta Say, N. Harm. Diss., II, 1829, p. 293; * Am. Conch., I, 1830, 

 pi. VI.— Short and Eaton, Trans. JL, 1831, p. 79.— * Conrad, New F. W. 

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

 ed., II, 1839, p.674.— *Chenc, Bib. Couch., 1st ser.. Ill, 184.5, p. 12, pi. ii, 

 fig. 1. — *Catlo\v and Reeve, Couch. Norn., 1845, p. 61. 



* Alasmodonta monodonta Ferussac, Guer. Mag., 1835, p. 26. 



* Margaritana monodonta Conkad, Pr. Ac. N. Sci., Phila. VI, 1853, p. 262. 



* Unio monodontus Say, Am. Conch., VI, 1834.— * Hanley, Test. Moll., 1842, p. 



210; " Biv. Shells, 1843, p. 210, pi. xxiii, fig. 48.—* H. and A. Adams, Gen., 

 Eec. Moll., II, 1857, p. 491.— *Kuster, Conch. Cab., 1861, p. 221, pi. lxxv, 

 fig. 1.— *B. H. Wright, Check List, 1888.— * P^etel, Conch. Sam., Ill, 1890, 

 p. 159. 



* Margarita ( Unio) monodontus 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, figs. 4, 4a, 

 46; * Manual, II, 1859, p. 137, fig. 661.— *Sowerby, Conch. Icon., XVI, 1866, 

 pi. XLV, fig. 243. 

 ''Margaritana soleniformis P/ETel, Conch. Sam., Ill, 1890, p. 173. 



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

 Iowa; Nebraska! 



tMARGARITANA DECUMBENS Lea. 



* Unio decnmhens Lea, Pr. Ac. N. Sci. Phila., V, 1861, p. 40. — * Lea, Jl. Ac. N. Sci. 



Phila., 1862, p. 87, pi. xii, fig. 236.— * Lea, Obs., VIII, 1862, p. 91, pi. xii, fig. 

 236.— * Sowerby, Conch. Icon., XVI, 1868, pi. Lxxxii, fig. 432.— «B. H. 

 Wright, Check List, 1888. 



* Margaron (Unio) decumhens Lea, Syn., 1870, p. 62. 



Alabama. 



Genus UNIO Retzius, 1788.i 



(Type, Unio tumidns Retzius.) 



Unio Retzius, Diss. Hist. Nov. Test. Gen., 1788, p. 16. — BRUGUiERji, Choix de 



Memoirs, 1, 1792, p. 106. 

 Limncea Poli (part), Test. Utr. Sic, I, 1791, p. 31. 

 Lymnimn Oken, Lehrbuch, 1815, p. 237. 

 Elliptio Rafinesque, ,J1. de Phys. Nat. Hist., 1819, p. 426. 

 Mysca Turton, Conch. Ins. Brit., 1822, p. 243. 



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

 his master, Retzius, 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, Retzius must be 

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



