xo.i-.M5. SYNOPSIS OF THE XAIADESSIMPSOX. 671 



Alasmidonta marginala RAFINESQI'E, An. Gen. Sci. Brnx., V, 1820, p. 317. 

 Margarita (Margarita-no) marginata LEA, Syu., 1836, p. 43; 1838, p. 27. 



* Alasmodon marginala GOULD, Iiiv. Mass., 1841, p. 116, fig. 77. * DE KAY, Zuol. 



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. 



* Anodonta marginata C. B. ADAMS, Thompson's Hist. Vt., 1842, p. 164; *F. W. 



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

 " Margaron (Margaritana) marginala LKA, Syn., 1852, p. 42; 1870, p. 67. 



* Raphia marginata H. and A. ADAMS, Gen. Rec. Moll., II, 1857, p. 500. 

 *Margariiana marginala GOULD, Inv. of Mass., 1870, p. 177, fig. 479. HARTMAN and 



MICHKNER, Conch. Cest., 1874, p. 93, fig. 191.* LATCHFORD, Tr. Ottawa F. N. 

 Club, 1882, p. 54.* B. H.WRIGHT, Check List, 1888.* H. CARPENTER, Naut., 

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



* Unio margiiuitiis CATLOW and REEVE, Conch. Noru., 1845, p. 61. 



* Unio raricosa LAMARCK, An. sans Vert., VI, 1819, p. 78. * DESHAYES, An. sans 



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

 I'-nio cariosa LAMARCK, An. sans Vert., VI, 1819, p. 80. 



* Alasmodon corrugata DE KAY, Zool. of N. Y., Pt. 5, 1843, p. 198, pi. xxiv, fig. 259. 

 " Mya rugulosa WOOD, Ind. Test., 3d ed., 1856, p. 199, pi. i, supp. fig. 7. 



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

 to South Carolina, 



tALASMIDONTA TRUNCATA B. H. Wright. 1 



* Alasmodonta truncata CONRAD, Pr. Ac. Nat. Sci. Phila., VI, 1853, p. 262. 

 ^Margaritana marginata KUSTER, Conch. Cab. Uuio, 1862, p. 297, pi. xcix, fig. 



3.* CALKINS, Pr. Ottawa Acad., 1874, p. 46. 



'Alasmodonta marginata BAKER, Moll. Chicago, Pt. 1, 1898, p. 62. pl.iv, fig. 4; 

 vn, fig. 7; xxn, fig. 3. 



* Margarilana marginata var. truncata B. H. W r RiGHT, Naut., XI, 1898, p. 124. 



I'nio marginatus SOWERBY, Conch. Icon., XVI, 1866, pi. LI, fig. 267. 



Upper Mississippi drainage; Ohio, Cumberland, and Tennessee river 

 systems; Michigan; Upper St. Lawrence drainage. 



tALASMIDONTA RAVENELIANA Lea. 



* Margaritana rareneliana LEA, Tr. Am. Phil. Soc., V, 1834, p. 106, pi. xvn, fig. 50; 



*Obs., I, 1834, p. 218, pi. xvn, fig. 50.* KUSTER, Couch. Cab. Unio, 1862, p. 

 297, pi. xcix, fig. 2. *B. H. WRIGHT, Check List, 1888..* P^TEL, Conch. 

 Sam., Ill, 1890, p. 173. 



* Alasmodonta raveneliana FERUSSAC, Guer. Mag., 1835, p. 26. 



* Margarita (Margaritana) raveneliana LEA, Syn., 1836, p. 44; 1838, p. 27. 

 *Margaron (Margaritana) raveneliana LEA, Syn., 1852, p. 42; 1870, p. 68. 

 *Baphia raveneliana H. and A. ADAMS, Gen. Rec. Moll, II, 1857, p. 500. 



* Strophitus raveneliannx CONRAD, Pr. Ac. Nat. Sci. Phila., VI, 1853, p. 263. 

 *Unio swananoensis HANLEY, Test. Moll., 1842, p. 211; Biv. Shells, 1843, p. 211, 



pi. xxin, fig. 39. CATLOW and REEVE, Conch. Noin., 1845, p. 64. 



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

 ner, less inflated, biaugnlate 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. 



