﻿LAMPSILTS 99 



Lampstijs sup.rostrata (SayV 



Shell elongated irregularly elliptical, subsolid, somewhat in- 

 flated, with moderately full beaks sculptured with numerous 

 delicate ridges that are sharply drawn up in the middle ; very 

 slightly winged ; rounded in front and rather sharply pointed 

 behind ; growth lines irregular ; posterior ridge moderately de- 

 veloped ; surface dull, dirty greenish-yellow, generally having 

 faint, wide, wavy rays on the hinder portion, often having con- 

 centric bands of lighter and darker color ; teeth compressed, 

 two pseudocardinals in each valve, the upper in the right 

 smaller, one lamellar lateral in the right valve and two in the 

 left ; muscle scars shallow ; beak cavities moderate ; nacre blu- 

 ish-white, scarcely thicker in front. The dorsal and ventral 

 lines of the male shell are nearly parallel ; it is more or less an- 

 gled at the post-base and ends behind in a rather sharp point 

 above the middle : the female shell is narrowed in front, with a 

 very large, rounded marsupial swelling and in front of this the 

 basal line is incurved. . • ] 



Length (male) 70, height 35, diam. 23 mm. 

 Length (female) 62, height 35, diam. 23 mm. " i 



Entire Mississippi drainage north to about latitude 41''. 

 Eastern half of Texas. 



Type locality, Wabash River. 

 Uiiio subrostratus Say, N. Harmony Diss., Jan. 15, 1831. 

 Lampsilis subrostratus Simpson. Syn., 1900, p. 546. 

 Burynia (Burynia) subrostrata Ortmann, Ann. Car. Mus., 



VITI, 1912, p. 344. 

 Unio nashi'iUimius Lra, Tr. Am. Phil. Soc, Y, 1834, p. 100, 

 pi. XIV. fig. 43 ; Obs., L 1834, p. 212, pi. xtv. fig. 43. — Han- 

 i.HY, Biv. Shells, 18.43, P- i93' P'- x^ni. fig. 31. — Kuster, 

 Conch. Cab. LTnio, 1861, p. 224, pi. lxxvi, figs, i, 2. — Sow- 

 KRBY, Conch. Icon., XVL 1866, pi. xxx, fig. 158. 

 Margarita (Ihiio) fuisJn'UIianus Lea. Syn.. 1836, p. 26; 1838, 



p. 20. 

 Margaron (Unio) noshviUianus Lea, Syn., 1852. p. 29. 

 Margaron (Unio) nashi'ilUcnsis Lea, Syn., 1870, p. 45. 



