G32 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL.XXII. 



* t Anodonta williamsii LKA, Pr. Ac. N. Sci. Phila., VI, 1862, p. 169; * Jl. Ac. N. Sci. 



Phila,, VI, 1866, p. 27, pi. x, fig. 26; *Obs.,XI, 1867, p. 31, pi. x, fig. 26. 

 *CLKSSIN, Conch. Cab. Ano., 1874, p. 154, pi. LI, figs. 1, 2. *B. H. WRIGHT, 

 Check List, 1888.* SOWERBY, Conch. Icon., XVII, 1870, pi. xxvm, fig. 112. 

 *Margaron (Anodonta) williamsil LEA, Syn., 1870, p. 81. 



* \Anodonta tryonii LKA, Pr. Ac. N. Sci. Phila., VI, 1862, p. 169; *J1. Ac. N. Sci. 



Phila., VI, 1866, p. 28, pi. x, fig. 27; *Obs., XI, 1867, p. 32, pi. x, fig, 27. 



* CLESSIN, Conch. Cab. Ano., 1874, p. 155, pi. LI, figs. 3, 4. * B. H. WRIGHT, 

 Check List, 1888. * P.ETEL, Conch. Sam., Ill, 1890, p. 186. 



*Margaron (Anodonta) tryonii LEA, Syn., 1870, p. 80. 



* Anodon tryonii HARTMAN and MICHENER, Conch. Cest., 1874, p. 95, fig. 195. 



Lower St. Lawrence drainage; streams draining into the Atlantic 

 south to North Carolina. This species has been cited from Grand 

 River, Michigan, and from north of Lake Superior. Mr. Bryant Walker 

 states that the former locality is erroneous, and I presume that the 

 latter is. 



f ANODONTA MARGINATA Say. 1 



Anodonta marginata SAY, Nich. Encyc., II, 1816, pi. in, fig. 5. *C. B. ADAMC, 

 Thompson's Hist. Vt., 1842, p. 14.* STIMPSON, Shells of N. Eng., 1851, p. 15. 



* Anodonta marginatus HANLEY, Biv. Shells, 1843, p. 217. 



* Anodonta fragilis LAMARCK, An. sans. Vert., VI, 1819, p. 85. * FERUSSAC, Gner. 



Mag., 1835, p. 25.* DESHAYES, An. sans. Vert., 2d ed., VI, 1835, p. 566; 3d ed., 



II, 1839, p. 678.* DELESSERT, Kec. Coq. Lam., 1841, pi. xni, fig. 2, le, 2, 26. 



* HANLEY, Test. Moll., 1842, p. 217; * Biv. Shells, 1843, p. 217. * CONRAD, Pr. 

 Ac. N. Sci. Phila., VI, 1853, p. 264.* CLESSIN, Conch. Cab. Ano., 1854, p. 73, pi. 

 xvn, figs. 3, 4. * H. and A. ADAMS, Gen. Rec. Moll., II, 1857, p. 502. * CHENT, 



III. Conch., 1858, pi. HI, figs. 4,4a. * LATCHFORD, Tr. Ottawa F. N. Club, 1882, 

 p. 56. B. H. WRIGHT, Check List, 1888.* P^TEL, Conch. Sam., Ill, 1890, 

 p. 179. 



* Margarita (Anodonta) fragilis LEA, Syn., 1836, p. 50; 1838, p. 30. 



* Anodon fragilis CATLOW and REEVE, Conch. Nom., 1845, p. 67. * SOWERBY, 



Conch. Icon., XVII, 1867, pi. xvn, fig. 61. 



* Margaron (Anodonta) fragilis LEA. Syn., 1852, p. 49; 1870, p. 78. 



* t Anodonta lacustris LEA, Pr. Ac. N. Sci. Phila., I, 1857, p. 84; *J1. Ac. N. Sci. 



Phila., 1860, p. 363, pi. LXII, fig. 188; ' Obs., VIII, 1860, p. 45, pi. LXII, fig. 

 188. * CLESSIN, Conch. Cab. Ano., 1873, p. I'.Ojpl. xxxm, figs. 5, 6.* LATCH- 

 FORD, Tr. Ottawa F. N. Club, 1882, p. 56.* B. H. WRIGHT, Check List, 1888. 



* P.ETEL, Conch. Sam., Ill, 1890, p. 181. 



* Anodon lacustris SOWERBY, Conch. Icon., XVII, 1867, pi. xix, fig. 73. 



* Margaron (Anodonta) lacustris, LEA, Syn., 1870, p. 80. 



* Anodon flava ANTHONY, Am. Jl. Conch., 1, 1865, p. 160, pi. xiv, fig. 3. 



* Anodon flava B. H. WRIGHT, Check List, 1888. 



* Anodon pallida ANTHONY, Am. Jl. Conch., I, 1865, p. 162, pi. xv, fig. 3. 



* Anodonta pallida, B.H.WRIGHT, Check List, 1888. *PJSTEL, Conch. Sam., Ill 



1890, p. 153. 



* Anodon pallidus SOWERBY, Conch. Icon., XVII, 1867, pi. xr, fig. 29. 



* Anodonta glandulosa ANTHONY, Am. Jl. Conch., I, 1865, p. 163, pi. xvi, fig. 3. 



* B. H. WRIGHT, Check List, 1888.* P.ETEL, Conch. Sam., Ill, 1890, p. 180. 



'I am very sure that this = the A. fragilis Lamarck, and not the fluviatilis Dillwyn, 

 as Dr. Lea believes. Say describes it as very thin and fragile; epidermis green 

 olive, paler on the disk, and greener before (behind), within bluish white, edged 

 with whitish, and from his dimensions and figure it is a smaller shell than Dillwyn'e, 

 the whole agreeing better with the fragilis of Lamarck. 



