Number 74 Skptkmbi;r-2o, 1919 



OCCASIONAL PAPERS OF THE MUSEUM OF 

 ZOOLOGY 



UNIVERSITY OF MICHIGAN 



Ann Arbor, Michigan Published by the University 



NOTES ON NORTH AMERICAN NAIADES. II 

 By Bryant Waeker 



Unio tenerus Ravenel, PI. I, figs. 1-6. 



Unio tenerus Ravenel, Catalogue, 1834, p, 7; Conrad, Pr. A. 



N. S. P., VI, 1853, p. 258; H. and A. Adams, Gen. Rec. 



Moll., II, 1857, p. 492; Simpson, Pr. U. S. N. M., XV, 1892, 



p. 416, pi. LVIII, figs. 5, 8. 

 Margarita {Unio) tenerus Lea, Syn., 1836, p. 39; 1838, p. 25. 

 Margaron (Unio) tenerus Lea, Syn., 1852, p. 39; 1870, p. 44. 

 Lampsilis ogeecheensis Simpson, (pars) Syn., 1900, p. 551 ; 



Desc. Cat., 1914, p. no. 

 Lampsilis nwdiolifonnis (pars) Simpson, Syn., 1900, p. 559; 



Desc. Cat., 1914, p. 135. 

 Lampsilis tenerus Mazyck, Cont. Charleston Mus., II, 1913, 



p. 23. 



This species has had a very unfortunate history. It was 

 never described by Ravenel. In his Catalogue of 1834, he 



