744 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxii. 



tUNIO ARATUS Lea. 



* Unio aratus Lea, Disc. 12 Uniones, 1843 ; * Tr. Am. Phil. Soc, IX, 1845, p. 282, pL 



XLii, fig. 12; *Obs., IV, 1848, p. 40, pi. xlii, fig. 12.—* H. and A. Adams, Gen. 

 Eec. Moll., II, 1857, p. 493.— * Sowerby, Conch. Icon., XVI, 1868, pi. lxiv, fig. 

 320.— *B. H. Wright, Check List, 1888.— *P^tel, Conch. Sam.. 111,1890, 

 p. 144. 



* Margaron ( Unio) aratus Lea, Syn., 1852, p. 28 ; 1870, p. 35. 



Central America. 



fUNIO GRANADENSIS Lea. 



* Unio granadensis Lea, Pr. Ac. N. Sci. Phila., XII, 1868, p. 95; * Jl. Ac. N. Sci. 



Phila., VI, 1868, p. 293, pi. xlii, fig. 103; *Obs.,XII, 1869, p. 53, pi. xlii, fig. 

 103.— *B. H. Wright, Check List, 1888. 



* Margaron { Unio) granadensis Lea, Syn., 1870, p. 35. 



Lake Nicaragua. 



The following species are of Rafinesque, but 1 am utterly unable to 

 make anything out of them : 



Unio dilatata, elliptica, fasciata, fragilis, levigata, nervosa, viridis, 

 zonata, all in Monograph, 1820; also Unio hicolor, calendis, castaneus, 

 cJiloris, diaplianus, fontinalis, fulvus, lasmabrachys, montanus, pallens, 

 platiolus, rivularis, rimosus, teneltus, venus, all in Continuation of 

 Monograph, 1831. 



Other indeterminate Unionidce of Eaflnesque are: Amhlema antrosa, 

 costata, gihhosa, olivaria, riibra, torulosa; Lasmonos fragilis; Obovaria 

 obovalis, pachostea; Obliquaria triangularis, attenuata, atroviolacea, 

 bullata, cliffordiana, cuprea, cypliia, ellipsaria, fasciolaris, flava,fiexuosa, 

 lateralis, lineolata, nodulata, obliquata, pusilla, quadrula, sintoxia, sin- 

 uata, subrotunda, all in Monograph, 1820. Bariosta diploderma, pon- 

 derosus, vittatis; Epilobasma biloba; Toxolasma cinerescens, cyclips, 

 fiexus, in Continuation of Monograph, 1831. 



The following are also indeterminate and spurious Unios: 



Unio tahetianus Catlow and Reeve, Conch. Nom., 1845, p. 64. Is probably U. 



taitianus Lea. 

 Unio largillierti Philippi, Menke's Zeits., 1847, p. 94. 

 Unio musicus Spengler, Skriv. Nat. Selsk., Ill, 1793, p. 67. 

 Unio radula Say, N. Harm. Diss., 1829, p. 323. 

 Unio plomiarius Villa, Disp. Conch. Terr. Fluv., 1841, p. 62. 

 Z7mo2Je2MO«mnMs LiNSLEY, Am. Jl.Sci., 1845, p. 277. 

 Unio iridescens Conrad, Cov. of Monog. No. 11. 

 Unio angusta Lamarck, An. sans. Vert., VI, 1819, p. 80. 

 Unio conus Spengler, Skriv. Nat. Selsk., 1792. 

 Unio delphinus Spengler, Skriv. Nat. Selsk., 1793, p. 63. 

 Unio doumeti Letourneux and Bourgnignat, Prod. Mai. Tunis., p. 163. 

 Unio disiortus Bean, Ann. and Mag., 1836, p. 376, fig. 53. 

 Unio liber Conrad, Am. Jl. Conch., II, p. 279. 

 Mya ohorata Solander, Portland Cat., p. 100. 



