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MarGaritana, Schumacker. 
Marg. arcuata. 
Alasmodonta arcuata, Barnes, Sillim. Journ. vi. 277, 12, 20. 
Gould, Invert. of Mass. 114, fig. 75. 
Dekay, Zool. of New York, 197, 14, 224. 
Margaritana margaritifera, Lea, (not Lin.) Synopsis, 43. 
M. arcuata, Stimpson, Shells of New England, 15. 
falcata, Gould. 
monodonta. 
Unio monodontus, Say, Amer. foonert pl. 6. 
Desh. ed. of Lam. An. sans Vert. vi. 553. 
Alas. monodonta, Fer. Guerin’s Mag. 1835, note 8, 31. 
U. Soleniformis, Lea, iv. §6, 10,16, Synopsis, 39. 
Chenu, Conchyl. Unio, pl. 14, fig. 4 
AxuasmMoponta, Say- 
arcula, Lea, 1838, vi. 71,22, 69, Synopsis, 42. 
confragosa, Say. Amer. Conch. pl. 21. 
U. confragosa, Desh. ed. of Lam. vi. 553. 
Marg. confragosa, Lea, Synopsis, 42. 
marginata, Say, Journ. Acad. Nat. Sc. i. 459. 
Barnes, Sillim. Journ. vi.-279. 
U. varicosa, Lam. An. sans. Vert. vi. 78, ane ed. 543. 
Mya rugulosa, Wood. Index, Sup. pl. 1, fie. 
Margaritana marginata, Lea, Synopsis, 42. 
Alas. marginata, Delay, Zool. of New York, 196, 14, 226. 
truncata, Say, MSS. Gould, Invert. 117. 
Alas. marginata, Awe. (Western var.) 
LertopeEa, Raf.. 
Lept. lata, Raf., Ann. v.51, 82,17, Poulson’s Trans. 61. 
U. dehiscens, Say, Disseminator, ii. 308. 
Amer. Conch. pl. 24. 
Desh. ed. of Lam. 554. 
U. oriens, Lea, v.4, 6,5, Synopsis, 43. 
U. dehiscens, Lea, Synopsis, 43. 
Chenu. Conchyl. Unio, pl. 14, fig. 2 
Anodonta lata, Fer. Guerin’s Mag. 1835, 25. 
U. latus, Say, Amer. Conch. Syn. of Unio, No. 44. 
leptodon, Raf., Ann. v. Poulson’s Trans. 21. 
U. leptodon, Say. Amer. Conch. Syn. of Unio, No. 6. 
Fer. Guerin’s Mag. 25. 
Con., Monog. 59, 33. 
U. planus, Barnes, Sillim. Journ. vi. 272. 
Anodonta purpurascens, Swain., Zool. Illust. ist ser. iii. pl. 160. 
Symphynota tenuissima, Lea, ili. 453, 11, 21. 
Unio tenuissima, Lea, Synopsis, 38. 
Srropuitus, Raf. Hemiopon, Swains. 
argenteus. 
Anod. argentea, Lea, 223, 19, 41. 
Arkansensis. 
Anod. Arkansensis, Lea, x. 293, 29, 56. 
calceolus. 
U. calceola, Lea, ii. 265, 3, 1. 
Desh. ed. of Lam. An. sans Vert. 546. 
Margaritana calceola, Lea, Synopsis, 43. 
