﻿454 I.ASTENA 



Anodonta (L.astcna) lata R.Mi'iNiisguE, Ann. Gen. Sci. Pliys. 



LJrux., \ , 1820, p. 317, pi. Lxxxii, figs. 17, 18. 

 .Iiiodonta lata I*'l:uussac, Guer. Mag., 1835, P- ^5- — Ciiuxu, 



I til). Conch , 1st sen, III, 1845, P- 26, pi. in, figs. 17, 18. 

 Lc[>todca lata Conuad, Pr. Ac. N. Sci. Phila., VI, 1853, P- 262. 

 Anodon lata Sowhruy, Conch. Icon., X\'1I, 1867, pl- ^'>^» ^g- 



76. 

 La^toia lata Simi'.sdn, Syn., 1900, p. 654. 

 Unio latiis Conrad, New J?. \V. Shells, 1834, p. 70. — Kustkr. 



Conch. Cab. Unio, 1861, p. 388, pi. i^xvii, fig. 5. 

 Unio dchisccns Say, N. Harm. Diss., II, 1829, p. 308 ; Am. 



Conch., Ill, 1830, pi. XXIV. — Hanley, Biv. Shells, 1843, p. 



204, pi. xxr, fig. 36. — Chenu, Bib. Conch., ist sen, III, 1845, 



p. 2)2, pl- IX, figs. 7-9. — SowERHY, Conch. Icon., XVI, 1868, 



pi. Lxxv, fig. 393. 

 Margarita (Unio) dchiscens Lea, Syn., 1836, p. 35; 1838, p. 



Hemilasfcna dehisccus Acassiz, Arch, fiir Xat.. I, 1852, p. 50. 

 Margaron (Margaritana) dehisccus Lea, Syn., 1852, p. 43; 



1870, p. 69. 

 Baphia dehisccus II. and A. Adams, Gen. Rcc. Moll., II, 1857, 



p. 499. 

 Margaritana dehiscetis Clesstn, Conch. Cah. Ano., 1873, p. 



274, pi. xxiv, figs. 3, 4. 

 Anodonta dcliiscois P.etel, Conch., Sam., Ill, 1890, p. 178. 

 Odatclia radiata K ai'ine.soue, Atlantic Jl. and Friend., 1832, 



P- I.S4- 

 Unio orieus Lea, Tr. .\m. Phil. Soc, IV, 1834. p. ~7^, \)\. \\, 



fig. 5; Obs., I, 1834, p. 83, pi. VI, fig. 5. — Chenu, 111. Conch., 



1858, pi. XIV, figs. 2, 2a, 2b. — KusTER, Conch. Cab., 1861, 



p. 222, pi. i.xxv, fig. 2. — SowERBY, Conch. Icon., XVI. 1868. 



pi. EXiii, fig. 314. 

 Unio hildrethi Dei.ESSERT. Rec. Coq. Lam., 1841, i:»l. xix. figs. 



40, 4b. 



The shell gapes decidedly in front and behind and is gen- 

 erally a little twisted or nneven along the line of jnnction of 

 the valves. The form varies a good deal, perhaps on account 

 of the fact that the species burrows. ^Many of the shells are 



