618 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxii. 



*Catlow and Reeve, Conch. Nom., 1845, p. 67. — * Sowerby, Conch. Icon., 

 XVII, 1870, pi. xxxii, fig. 128, 



* Margaron (Anodonta) pavonia Lea, Syn., 1852, p. 50; 1870, p. 79. 



* Strophitus pavonius Baker, Moll. Chicago, Pt. 1, 1898, p. 68, pi. iii, fig. 5; v, fig. 3. 



* Anodon annulatus Soweuby, Conch. Icon., XVII, 1867, pi. xviii, fig. 67. 



Entire Mississippi drainage; St. Lawrence system and south in 

 streams draining into the Atlantic to North Carolina; north in the 

 British possessions to Lake Winnipeg; southwest to central Texas; 

 Tyner, Alabama. 



fSTROPHITUS UNDULATUS Say.' 



Anodonta undulata Say, Nich. Enc, II, 1816, pi. iii, fig. 5. — Short and Eaton, 

 Transylvania Jl., 1831, p. 81. — *rERUSSAC, Guer. Mag., 1835, p. 25.— *C. B. 

 Adams, F. W. and L. S. of Vt., 1842, p. 15.— *Hanley, Test. Moll., 1842, p. 

 217; Biv. Shells, 1843, p. 217.—* H. and A. Adams, Gen. Eec. Moll., II, 1857, 

 p. 503.— *Latcheord, Tr. Ot. F. N. CL, 1882, p.55.— *B. H, Wright, Check 

 List, 1888.—* H. Carpenter, Naut., IV., 1890, p. 57.—* P^tel, Conch. Sam., 

 Ill, 1890, p. 186. 



^.Margarita {Anodonta) undulata Lea, Syn., 1836, p. 50; 1838, p. 30. 



* Anodon undulata Catlow and Reeve,' Conch. Nom., 1845, p. 68. 



* Alasmodonta undulata C. B. Adams, Thompson's Hist. Vt., 1842, p. 165. 

 *Margaron {Anodonta) undulata Lea, Syn., 1852, p. 49; 1870, p. 79. 

 ""Strophitus undtilatus Stimpson, Shells of N. Eng., 1851, p. 15.— * Conrad, Pr. Ac, 



N. Sci. Phila., VI, 1853, p. 263. 



* Anodonta jjennsylvanica IjAMarck, An. sans Vert., VI, 1819, p. 86. — * Stark, Elem. 



Nat. Hist., II, 1828, p. 89.— * Deshayes, An. sans Vert., 2d ed., VI, 1835, p. 

 567; 3d ed., II, 1839, p. 678.— * Delessert, Rec. Coq. Lam., 1841, pi. xiii, 

 figs. 4a, 4&. — * Chenu, 111. Conch., 18."8, pi. iii, figs. 5, 5a. — * H. and A. Adams, 

 Gen. Rec. Moll., II, 1857, p. 503. 



* Anodon papyracem Anthony, Am. Jl. Conch., 1, 1865, p. 161, pi. xv, fig. 2. — * Sow- 



erby, Conch. Icon., XVII, 1867, pi. xiv, fig. 46. 



* Anodonta pap yraceaB. H. Wright, Check List, 1888. — *P^tel, Conch. Sam., Ill, 



1890, p. 183. 

 *Margaron {Anodonta) ;papyracea Lea, Syn., 1870, p. 81. 

 . * Anodon quadriplicatus Sowerby, Conch. Icon., XVII, 1867, pi. xxviii, fig. 110. 



Northern New England to Virginia, in streams draining into the 

 Atlantic. This species is rei)orted from Manitoba, but it is probable 

 that the specimens from that region are 8. edentulus. 



tSTROPHITUS CONNASAUGAENSIS Lea. 



'^Margariiana connasaugaensis Lea, Pr. Ac. N. Sci. Phila., II, 1857, p. 135; *J1. Ac. 



N. Sci. Phila., IV, 1859, p. 229, pi. xxxii, fig. 113; * Obs., VII, 1859, p. 47, pi. 



xxxii, fig. 113. — * B. H. Wright, Check List, 1888. — *Pjetel, Conch. Sam., 



Ill, 1890, p. 172. 

 *Margaron {Margaritana) connasaugaensis Lea, Syn., 1870, p. 69. 



* Unio connasaiighensis Sowerby, Conch. Icon., XVI, 1868, pi. Lxxxviii, fig. 474. 

 *Margaritana connesaugensis Clessin, Conch. Cab. Ano., 1875, p. 269, pi. lxxxi, 



figs. 7, 8. 



' Much confusion exists concerning this and the preceding species. The edentulus is 

 much the larger and solider shell ; the undulatus being a small, thin form (Say's figure 

 is only about half an inch long, from a young or very dwarf specimen), usually quite 

 distinctly biangalate behind. The latter is confined to the Atlantic drainage, while 

 the former is found in this area and in the Mississippi Valley. 



i 



