NO. 1205. SYNOPSIS OF THE KAIADES—SIMPSOX. 671 



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'Alasmidonta marginata Eafustesque, An. Gen. Sci. Brnx., V, 1820, p. 317. 

 " Margarita {Margariiana) marginata Ltja, Syn., 1836, p. 43; 1838, p. 27. 



* Alasmodon marginaia Gould, Inv. Mass., 1841, p. 116, fig. 77. — * De Kay, Zool. 



of N. Y., Pt. 5, 1843, p. 196, pi. xiv, fig. 225. 



* Unto marginata Hanley, Test. Moll., 1842, p. 211; " Biv. Shells, 1843, p. 211, pi. 



XXI, fig. 23. 

 ^ A)iodonta marginata C. B. Adams, Thompson's Hist. Yt., 1842, p. 164; *F. W. 



and L. S. of Vt., 1842, p. 14.— * Stimpson, Shells of N. Eug., 1851, p. 15. 

 ^ Mar gar on {Margaritana) marginaia 'L^A, Syn., 1852, p. 42; 1870, p. 67. 

 ^ Bapliia marginata H. and A. Adams, Gen. Rec. Moll., II, 1857, p. 500. 

 ^Margariiana marginaia GouLD, Inv. of Mass., 1870, j). 177, fig. 479. — Hartman and 



MicHENER, Conch. Cest., 1874, p. 93, fig. 191. — *' Latchford, Tr. Ottawa F. N. 



Cluh, 1882, p. 54.—^^ B. H. WriCxHT, Che^ck List, 1888.—* H. Carpenter, Nant., 



IV, 1890, p. 46.—* P.etel, Couch. Sam., Ill, 1890, p. 173. 

 *Unio marginatus Catlow and Reeve, Conch. Nom., 1845, p. 61. 



* Unio varicosa Lamarck, An. sans Vert., YI, 1819, p. 78. — * Deshayes, An. sans 



Vert., 2d ed., VI, 1835, p. 543 ; 3d ed., II, 1839, p. 671. 



* Unio cariosa Lamarck, An. sans Vert., VI, 1819, p. 80. 



"" Alasmodon corriigata.DE Kay, Zool. of N. Y., Pt. 5, 1843, p. 198, pi. xxiv, fig. 259. 

 " Mya rugnJosa Wood, lud. Test., 3d ed., 1856, p. 199, pi. i, supp. fig. 7. 



Lower St. Lawrence ; southward in streams draining into the Atlantic 

 to South Carolina. 



I ALASMIDONTA TRUNCATA B. H. Wright.' 



"" Alasmodonta trnncataX)OJ>!RA'D, Pr. Ac. Nat. Sci. Phila., VI, 1853, p. 262. 

 ^Margariiana marginaia Kuster, Conch. Cab. Unio, 1862, p. 297, pi. xcix, fig. 



3.—* Calkins, Pr. Ottawa Acad., 1874, p. 46. 

 ^Alasmodonta marginata Baker, Moll. Chicago, Pt. 1, 1898, p. 62. pi. iv, fig. 4; 



VII, fig. 7;xxii, fi^g. 3. 

 ^Margariiana marginata var. truncata B. H. Wright, Naut., XI, 1898, p. 124_ 

 " Unio marginaius Sowerby, Conch. Icon., XVI, 1866, pi. li, fig. 267. 



Upper Mississippi drainage; Ohio, Cumberland, and Tennessee river 

 systems; Michigan; Upper St. Lawrence drainage. 



i ALASMIDONTA RAVENELIANA Lea. 



*" Margaritana raveneliana Lea, Tr. Am. Phil. Soc, Y, 1834, p. 106, pi. xvii, fig. 50; 



*Obs., I, 1834, p. 218, pi. xvii, fig. 50.—* Kuster, Couch. Cab. Unio, 1862, p. 



297, pi. xcix, fig. 2.— *B. H. Wright, Check List, 1888. — * P.etel, Conch. 



Sam., Ill, 1890, p. 173. 

 ^Alasmodonta raveneliana Ferussac, Guer. Mag., 1835, p. 26. 



* Margarita (Margariiana) raveneliana Lea, Syn., 1836, p. 44; 1838, p. 27. 

 *' Margaron {Margariiana) raveneliana Lea, Syn., 1852, p. 42; 1870 p. 68. 

 *BapUia raveneliana H. and A. Adams, Gen. Rec. Moll, II, 1857, p. 500. 



* Strophitns raveneJianns Conrad, Pr. Ac. Nat. Sci. Phila., VI, 1853, p. 263. 

 ""Unio stvananoensis Hanley, Test. Moll., 1842, p. 211; Biv. Shells, 1843, p. 211, 



pi. xxiii, fig. 39. — Catlow and Reeve, Conch. Nom., 1845, p. 64. 



' Say's manuscript. I believe this to be specifically different from the smaller, thin- 

 ner, less inflated, biangulate A. marginata. The latter is confined to the Atlantic 

 drainage; the former belongs to the Mississippi Valley, but has migrated into the St. 

 Lawrence basin. No description was published of this form that I know of until 

 that of Mr. Wright appeared. 



