NO. 1205. SYNOPSIS OF THE NAIADES— SIMPSON. 539 



(Group of Lampsilis ligamentinus.) 



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

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

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

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

 greatly swollen in the post basal region. 



t LAMPSILIS LIGAMENTINUS Lamarck.i 



Unio crassvs Say, Nich. EDcyc, II, 1816, pi. i, fig. 8. — *Rafinesque, Ann. Gen. 

 Sci. Brux., V, 1820, p. 293]—'* Hildretii, 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.— *Catlow and Reeve, Conch. Norn., 1845, p. 58. 

 — *SowERBY, Conch. Icon., XVI, 1866, pi. xl, fig. 220.— * P.etel, Couch. 

 Sam., Ill, 1890, p. 149. 



* Marcjarita ( Unio) crassus Lea, Syn., 1836, p. 24; 1838, p. 19. 

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



* Unio ligamentina Lamarck, An. sans Vert., VI, 1819, p. 72.- — * Ferussac, Guer. 



Mag., 1835, p. 27.—* Desha yes. 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.—* II. and A. Adams, Gen. Rec. Moll., II, 

 1857, p. 494.— * CAI.KINS, Pr. Ottawa Ac. Sci., 1874, p. 43.—* B. II. Wright, 

 Check List, 1888.— * P.etel, Couch. Sam., Ill, J890, p. 157.— * Call, Tr. Ac. 

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



* Margaron (Unio) ligamentinus I^ea, Syn., 185% p. 28; 1870, p 43. 



* Lampsilis ligamenUnus Baker, Moll. Chicago, Pt. 1, 1898, p. 108, pi. xvi. — * Smith, 



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

 *Lmio elUpticus Barnes, Am. Jl. Sci., VI, 1823, p. 259, pi. xiii, fig. 19 (outline). — 



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

 *Mya ellipHca Eaton, Zool. Text-Book, 1826, p. 219. 



* Unio carinatus Bahnes, Am. Jl. Sci., VI, 1823, p. 259, pi. xi, fig. 10. 

 ""Mya caritiata Eaton, Zool. Text-Book, 1826, p. 220. 



* Unio ellipsarius Say, Am. Couch., VI, 1834. 



* Unio fasciatus Say, Am. Conch., VI. 1834. — *Conrad, Monog., 1835, p. 3, pi. i. — 



* Ferussac, Guer. Mag., 1835, p. 27. — * Potiez and Michaud, Gall. Moll., 1844, 

 153, pi. lviii, tig. 5. — * Kuster, Conch. Cab., 1852, p. 31, pi. v, fig. 3. 



"'Mya gravis Wood, Ind. Test. (Hanley) 1856, p. 199, pi. i, fig. 6. 



* Unio gravis P.etel, Conch. Sam., Ill, 1890, p. 154. 



* Unio luteolus Sowerby, Conch. Icon., XVI, 1867, pi. lviii, fig. 293a. 

 *Unio delodonlus Sowerby, Conch. Icon., XVI, 1867, pi. lvii, fig. 288. 



* Unio crassidevs Sowerby, Conch. Icon., XVI, 186^, pi. lxii, fig. 312. 



* Unio pictus Sowerby, Conch. Icon., XVI, 1868, pi. lxii, fig. 313. 

 *Unio venustus Sowerby, Couch. Icon., XVI, 1868, pi. LXiv, fig. 326. 



* Unio upsoni Marsh; Conch., Ex. 1, 1887, p. bl:-—B. H. Wright, Check List, 



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

 previously for a European Unio. 



^Thtj description was read before the Mercer County, Illinois, Scientific and His- 

 torical Society March 12, 1880. Mr. Marsh had copies of the description published 

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



