NO. 1205. SYNOPSIS OF THE NAIADES-SIMPSOX. 539 



(Group of Lampsilis iiyamentinun.} 



Shell solid, evenly elliptical, not greatly inflated, witli a yellowish 

 green epidermis, with broad, usually broken, dark-green rays; beaks 

 not prominent, sculpture fine, restricted in area, pseudocardinals rather 

 small, stumpy; nacre silvery or rarely pinkish. The female shell is not 

 greatly swollen in the post basal region. 



tLAMPSILIS LIGAMENTINUS Lamarck. 1 



Unio crassus SAY, Nich. Eiicyc., II, 1816, pi. i, fig. 8. *RAFINESQUE, Ann. Gen. 



Sci. Brux., V, 1820, p. 293." HILDRETH, Am. Jl. Sci., XIV, 1828, p. 278, fig. 1. 



*FERUSSAC, Guer. Mag., 1835, p. 27. *HANLEY, Test. Moll., 1842, p. 192; 



*Biv. Shells, 1843, p. 192. *CATLO\V and REEVE. Conch. Xom., 1845, p. 58. 

 -* SOWERBY, Conch. Icon., XVI, 1866, pi. XL, fig. 220.* P.ETEL, Conch. 



Sam., Ill, 1890, p. 149. 

 "Margarita (Unio) crassus LEA, Syu., 1836, p. 24; 1838, i>. 11>. 



* Mya crassa EATON, Zool. Text-Book, 1826, p. 217. 



* Cnio Hgamentlna LAMARCK, An. sans Vert., VI, 1819, p. 72. * FERUSSAC, Guer. 



Mag., 1835, p. 27.* DESHAYES, An. sans Vert., 2d. ed.,VI, 1835, p. 533; 3d ed., 

 II, 1839, p. 668. 



* Unio ligamentinus KUSTEK, Couch. Cab. Unio, 1852, p. 23, pi. in, fig. 3. * CONRAD, 



Pr. Ac. N. Sci. Phila., VI, 1853, p. 251.* H. and A. ADAMS, Gen. Rec. Moll., II, 

 1857, p. 494. * CALKINS, Pr. Ottawa Ac. Sci., 1874, p. 43.* B. H. WRIGHT, 

 Check List, 1888. * P.ETEL, Conch. Sam., Ill, ]890, p. 157. "CALL, Tr. Ac. 

 Sci. St. Louis, VII, p. 22, pi. xxi. 



* Margaron (Unio) Uijdiiteiitinits LEA, Syn., 1859, p. 28; 1870, p43. 



* Lantpsilis It ;/ amen Hint s BAKER, Moll. Chicago, Pt. 1, 1898, p. 108, pi. x vi. * SMITH, 



Bull. U. S. Fish Com., 1899, p. 291, pi. LXXIX. 



* Lnio elliplicua BARNES, Am. Jl. Sci., VI, 1823, p. 259, pi. xin, fig. 19 (outline). 



* HILDRETH, Am. Jl. Sci., XIV, 1828, p. 278. 

 *Mya elliplica EATON, Zool. Text-Book, 1826, p. 219. 



* rnio carinatus BAHNES, Am. Jl. Sci., VI, 1823. p. 259, pi. xi, fig. 10. 

 *Mya carinata EATON, Zool. Text-Book, 1826, p. 220. 



*Unio eUipsariim SAY, Am. Conch., VI, 1834. 



* Unio fasciatus SAY, Am. Concb., VI. 1834. *CONI:AD, Monog., 1835, p. 3, pi. i. 



* FERUSSAC, Guer. Mag., 1835, p. 27.* POTIKZ and MICHAUD, Gall. Moll., 1844, 

 153, pi. LVIII, tig. 5. * KUSTER, Couch. Cab., 1852, p. 31, pi. v, fig. 3. 



~Mya grans WOOD, Ind. Test. (Hanley) 1856, p. 199, pi. i, fig. 6. 



* Unio grari* P.ETEL, Conch. Sam., Ill, 1890, p. 154. 



* Unio hiteolns SOWERBY, Conch. Icon., XVI, 1867, pi. LVIII, tig. 293a. 

 *r/<io dclodonhta SOWERBY, Conch. Icon., XVI, 1867, pl.Lvn, fig. 288. 



* Unio crassidt'iix S< >\VERBY, Conch. Icon., XVI, 186 s *, pi. LXII, fig. 312. 



* Unio piclus SOWERBY, Couch. Icon., XVI, 1868, pi. LXII, fig. 313. 



* Unio venitstun SOWERBY, Couch. Icon., XVI, 1868, pi. LXIV, fig. 326. 



* Unio upsoni MARSH, Couch., Ex. 1, 1887, p. 51. 2 B. H. WRIGHT, Check List, 1888. 



1 Say's name crasstis applied to this before that of Lamarck was used by Retzius 

 previously for a European Unio. 



2 Tbe description was read before the Mercer County, Illinois, Scientific and His- 

 torical Society March 2, 1880. Mr. Marsh had copies of the description published 

 and thinks that the species was described on the records. It was not figured 



