﻿LAMPSII.IS 47" 



r.AMPSiijs CAPAx (Green). 



Shell greatly inflated, subsolid, obovate, with an excessively 

 full, high, rounded umbonal region; the beak sculpture consist- 

 ing of very faint, oblique ridges; surface generally smooth 

 and somewhat shining, of a smoky, yellowish or reddish- 

 brown, somcrimcs a smoky olive-color; rest marks distinct; 

 ligament moderately long, passing forward under the beaks 

 and appearing in front of them in a rather wide lunule ; pos- 

 terior ridge full and rounrled ; hinge line very strongly doubly 

 curved ; left valve with a single, sometimes a partially double, 

 pseudocardinal in front of the beak, generally ragged and 

 considerably conipressed ; the hinge line is narrow and rounded 

 behmd it, and has two small, compressed, distant laterals; right 

 valve with two compressed, ragged pseudocardinals opposite 

 each other, the upper extending back to the beak, and a single, 

 high, thin, decidedly truncate lateral; beak cavities deep and 

 very wide ; muscle scars shallow, smooth ; pallial line distinct ; 

 nacre bluish-white, pinkish or salmon-tinted. The shells are 

 all full at the posterior base, those of the female but little- 

 more inflated in that region than are the males. 



Length 115, height 80. diam. 70 mm. 



Lower Ohio River drainage ; southwest to St. Francis River, 

 Arkansas ; north to eastern Iowa ; Elkhorn and Blue Rivers,. 

 Nebraska? (Aughey). 



Type locality, Falls of St. Anthony ; Bayou Teche. 

 Unio capax Green, Cab. Nat. Hist., II, 1832, p. 290.— Conrad, 



Monog., IX, 1837, p. 75, p,l. XLii.—KusTER. Conch. Cab! 



Imio, 1852, pp. 21, 65. pi. XV. fig. 3.— SowERBY, Conch, 



Icon., XVT, 1866, pi. LIT, fig. 274. 

 Margaron (Unio) capax Lea, Syn., 1852, p. 27; 1870, p. 42. 

 Lampsilis capax Smith, Bull. U. S. Fish Com., 189Q, p. 291, 



pi. i.xxxiv. — Simpson, Syn., 1900, p. 529. 

 Symphynota globosa Lea, Tr. Am. Phil. Soc, \', 1832, p. 41, 



pi. IV, fig. 12; Obs., I, 1834, p. 153, pi. IV, fig. 12. 

 Margarita (Unio) globosa Lea, Syn., 1836. p. 2;^. 

 Margarita (Unio) globosiis Lea, Syn.. 1838, p. 18. 

 Unio globosus Hanley, Test. Moll., 1842, p. 188. 



