﻿LAMPSirjS 6l 



at their anterior end ; right valve with two pseudocardinals, 

 tlie lower much the larger, and one lateral, which is sometimes 

 a little truncate behind ; muscle scars large, well marked, 

 smooth : beak cavities rather shallow, exhibiting a row of four 

 or five dorsal scars ; pallial line well marked ; nacre white, blu- 

 ish-white, straw-colored or pink, usually bright, thicker in front. 

 Female shell with a most decided marsupial swelling, and hav- 

 ing the blunt posterior point somewhat higher up (three-fifths 

 of the height) than that of the male (about half way up), and 

 it is usually more inflated. 



Length (male) loo, height 60, diam. 40 mm. 



Length (female) 105, height 57, diam. 50 mm. 



Entire Mississippi drainage, southwest to the Brazos River, 

 Texas ; St. Lawrence drainage, entire Dominion of Canada 

 east of the Rocky Mountains. 



Type locality, Susquehanna and Mohawk Rivers. 

 Unio luteola Lamarck, An. sans Vert., VI, 1819, p. 79. 

 Unio luteolns De Kay, Z0OI. of New York, Pt. 5, 1843, P- IQ^* 



pi. XX, fig. 241. — Hani^ey, Biv. Shells, 1843, p. 192, pi. xxiir, 



fig. 16. — SowERiJY, Conch. Icon., XVL 1867, P'- LViir, figs. 



293. 293a, 293/?. — Call, Tr. Acad. Sci., St. Louis, VH, 1895, 



p. 25, pi. in. 

 Margarita (Unio) luteolus Lka, Syn., 1836, p. 25 ; 1838, p. 19. 

 Margaron (Unio) luteolns Lra, Syn.. 1852, p. 28; 1870, p. 44. 

 Lampsilis luteolns Baker, Moll. Chicago, Pt. i, 1898, p. 103, 



pis. xr, xxxvii, fig. 12. — Simpson, Syn., 1900, p. 534. 

 Unio intlatns Barnes, Am. Jl. Sci., YL 1823, p. 266. 

 Mya infiata Evton. Zool. Text-Book, 1826, p. 221. 

 Unio siliquoideus Barnes, Am. Jl. Sci., VL 1823, p. 269, pi. 



XIII, fig. 150 (outline). — Conrad, Monog., H, 1836, p. 22, 



pi. X, fig. I. 

 Unio siliqnoides Kuster, Congh. Cab. Unio, 1852, p. 30, pi. v, 



fig. 2. 

 Mya siliqnoidea Eaton, Zool. I'ext-Book, 1826, p. 221. 

 Lampsilis siliqnoidea Stimpson, Shells of New Eng., 1851, 



p. 14. 

 Unio childreni Hani.ry, Biv. Shells, 1843, p. 193, pi. xxiii, 



fig- 57- 



