oy 
1853.] 257 
Unio rivularis, Coz. Journ. Acad. Nat. Sc. 1853, ‘ili. 2d series. 
U. declivis, Coz. (not Say) Monog. 45, 23, 1. 
Kust. Chemn. Unio, pl. 14, fig. 1. 
Lea, Synopsis, 33. 
*Roanokensis, Lea, 1838, vi. 27, 8, 21, Synopsis, 32. 
rosaceus, Deiay, Zool. of New York, 192, 39, 355, 356, and pl.40, fig.357. 
rotundatus, Lam. An. sans Vert. Desh. ed. vi. 538. 
U. suborbiculata, Lam. Desh. ib. 546. 
decorticata, Raf. Ann. v. 36, Poulson’s Trans. 33. 
glebulus, Say, Amer. Conch. pl. 34. 
subglobosus, Lea, v.- 30, 2, 3. 
rotundatus, Lea, Synopsis, 34. 
tubellus, Coz. New Fresh Water Shells, 38, 6, 2. 
Lea, Synopsis, 34. 
Ruber, Raf. v.48, Poulson’s Trans. 55. 
U. pyramidatus, Lea, iv. 109,16, 39, Synopsis, 25. 
Chenu, Conchyl. Unio, pl. 16, fig. 5. 
U. coccineus, Jay, (not Hildreth,) Catalogue, 66. 
rudis, Con. Monog. 76, 43, 1. 
U. Ravenelianus, Lea, v. 32,3,5, Synopsis, 26. 
tufusculus, Lea, 1852, x. 258, 14,7, Synopsis, 33. 
Rumphianus, Lea, 1852, x. 276, 22, 34. 
sagittiformis, Lea, 1852, x. 277, 22,35, Synopsis, 37. 
Sapotalensis, Lez, viii. 233, 21,47, Synopsis, 29. 
Chenu, Conchyl. Unio, pl. 33, fig. 4. 
saxeus, Con. Monography of North American Unionide, 109, 60, 1. 
satur, Lea, 1852, x. 265, 17,19, Synopsis, 24. 
Lea, Synopsis, 27. 
*seeuriformis, Coz. Journ. A. N.S. i. 275, 37, 1. 
semigranosus, V. d. Busch. 
Phillippt, Conchyl. Unio, 1, 1, 1, 2, 3. 
Lea, Synopsis, 20. 
Shepardianus, Lea, 1834, v.95, 13, 38, Synopsis, 35. 
Con. Monog. 70, 39. 
simus, Lea, 1838, vi. 26, 8,20, Synopsis, 31. 
sintoxia,* Raf. v.44, Poulson’s Trans. v.48. 
sordidus, Lea, 1852, x. 254,12,1. Synopsis, 33. 
Sowerbianus, Lez, 1834, v. 68,10, 28, Synopsis, 25. 
Con. Monog. 66, 37, 1. 
sparsus, Lea, 1841, viii. 242, 25,58, Synopsis, 22. 
Chenu, Conchyl. Unio, pl. 26, fig. 2. 
spatulatus, Lea, 1845, x. 80, 8, 22. 
spinosus, Lea, vi. 57, 16, 50, Synopsis, 23. 
Chenu, Conchy]. Unio, pl. 22, fig. 6. 
splendidus, Lea, vi. 70, 19,61, Synopsis, 27. 
Chenu, Conchyl. Unio, pl. 17, fig. 7. 
stagnalis, Con. Journ. Acad. Nat. Sc. 2d ser. i. 275, 37, 2. 
Lea, Synopsis, 27. 
* The specimen in Mr. Poulson’s cabinet labelled sixtozia by Rafinesque is 
a large compressed shell, similar in outline to U. coceinews. Length 3§ inches; 
height 3 inches. 
