﻿84 LAMPS 1 1. IS 



Unio pulchcr Lka, Tr. Am. Phil. Soc, VI, 1838, p. 6, pi. in, 



fig. 6 ; Obs., II, 1838, p. 6, pi. Ill, fig. 6. — Hani^ey, Biv. 



Shells, 1843, p. 193, pi. XXIII, fig. 7. — Chi5NU, 111. Conch., 



1858, pi. XVII, figs. 2, 20, 2b. — KusTBR, Conch. Cab. Unio, 



186 1, p. 193, pi. LXI, fig. 5. 

 Margarita (Unio) pulcher Lea, Syn., 1836, p. 25 ; 1838, p. 19. 

 Margaron (Unio) pulcher Lea, Syn., 1852, p. 28; 1870, p. 44. 

 Unio interruptus Lea, Tr. Am. Phil. Soc, VI, 1838, p. 15, pi, 



VI, fig. 15 ; Obs., II, 1838, p. 15, pi. VI, fig. 15. — HANI.EY, Biv. 



Shells, 1843, P- ^9^> pl- ^^^> ^S- 28. — Chenu, 111. Conch., 



1858, pi. XVII, figs. 4, 40, 4b. 

 Margarita (Unio) interruptus Lea, Syn., 1836, p. 24; 1838, p. 



19. 

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



43- 



Unio laiiradiatits Conrad, Monog., XI, 1838, p. 96, pi. Liii. — 

 Kuster, Conch. Cab. Unio, 1861, p. 208, pi. lxix, fig. 3. 



Unio tennesseensis Lea, Pr. Am. Phil. Soc, I, 1840, p. 288; Tr. 

 Am. Phil. Soc, VIII, 1843, p. 199, pi. x, fig. 11 ; Obs., Ill, 

 1842, p. 37, pi. X, fig. 11. — Chenu, 111. Conch., 1858, pi. 

 xxvii, figs. I, I a, lb. 



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



P-43- 

 Unio pcrdix Reeve, Conch. Icon., XVI, 1864, pl- xviii, fig. 82. 



The young shells are often brilliantly printed, and the rays 

 are either entire or broken. Old shells become duller colored 

 and are sometimes badly worn. The species probably lives in 

 rapids. After a careful study of all of the above so-called 

 species I cannot see that they possess any characters that make 

 them worthy even of varietal names. 



Lami'Sius picta (Lea). 



Shell elliptical or obovate, subsolid, compressed, with flat- 

 tened but sharp-pointed beaks, which have irregular, corrugat- 

 ed, somewhat doubly-looped sculpture ; posterior ridge scarcely 

 developed ; above it is a wide, shallow, radial depression end- 



