1853.] 
Unio teres, Raf. Ann., v.55, Poulson’s trans. 68. 
Con. Monog. 52, 28. 
Fer. Guerin’s Mag. 1835, 27. 
Say, Synonym. of Unio, No. 42. 
U. Anodontoides, Lea, iv. 86,8, 11, Synopsis, 36. 
Chenu, Conchyl. Unio, pl. 14, 3. 
trabalis, Coz. New Fresh Water Shells, May, 1834, 27,3, 5. 
Monog., 110, 60, 2. 
U. Troostensis, Lea, Aug. 1834, v.71, 10, 30, Synopsis, 25. 
trigonus, Lea, 1832, iv. 110, 16,40, Synopsis 25. 
tortivus, Lea, 1842, viii. 204, 12,17, Synopsis 24. 
Chenu, Conchyl. Unio, pl. 29, fig. 6. 
torulosus, Raf. (obliquaria) Ann. v. 48, Poulson’s Trans. 56. 
Fer., Guerin’s Mag. 1835, p. 28. 
Kust., Chemn. Unio, 28, 4, 3, 4. 
Say, Amer. Conch. Synonym. of Unio, No. 40. 
U. gibbosus, Raf., Cor. Monog. 50, 27. 
Kust. Chemn. Unio, 28, 4,3, 4. 
U. perplexus, Lea, iv. 122, 17,42, Synopsis, 23. 
Chenu, pl. 18, fig. 5. 
triqueter, Raf. Ann. v.34, Poulson’s Trans. 31. 
U. triangularis, Barnes, vi. 272, fig. 17. 
U. formosus, Lea, iv. 111, 16, 41. 
Chenu, Conchyl. Unio, pl. 8, fig. 12. 
U. triangularis, Lea, Synopsis, 22. 
truncatus, Raf. Ann. v. 35, Poulson’s Trans. 31. 
Fer. Guerin’s Mag. 1835, 
Say, Amer. Conch. Synonym. of Unio, No. 
U. elegans, Lea, iv. 83, 9,13, Synopsis, 23. 
Chenu, Conchyl. Unio, pl. 15, fig. 3. 
-trossulus, Lea, ix. 278,40, 6, Synopsis, 25. 
\ tuberosus, Lea, 1842, viii. 210, 14, 25, Synopsis, 22. . 
Chenu, pl. 28, fig. 7. 
tumescens, Lea, 1845, x. 71, 3,7. Synopsis, 25. 
undatus, (7) Barnes, Sillim. Journ. vi. 121, 4, 4. 
unicolor, Lea, 1845, x. 74, 4, 12, Synopsis, 34. 
utriculus, Lea, 1845, x. 69,1,3, Synopsis, 
Vanuxemiensis, Lea, 1838, vi. 36,11, 31, Synopsis, 29. 
Chenu, Conchyl. Unio, pl. 19, fig. 3. 
Vaughnianus, Lea, vi. 5,3,5, Synopsis, 38. 
Chenu, Conchyl. Unio, pl. 21, fig. 1. 
velatus, Con., 1853, Journ. Acad. Nat. Sc. iil. 2d series. 
venustus, Lea, 1838, vi. 4,2,4, Synopsis, 27. 
Chenu. Conchyl. Unio, pl. 22, fig. 1. 
verrucosus, Raf. Ann. v. 42, Poulson’s Trans. 44. 
U. tuberculatus, Barnes, Sillim. Journ. vi. 
Hildreth, Sillim. Jour. xiv. 281, fig. 8. Lea, Synopsis, 23. 
viridis, (0) Raf. Ann. v.27, Poulson’s Trans. 19. ————»+ <: 
Con., Monog., 36, 17, 1. 
U. Tappanianus, Lea, vi. 62, 17,55, Synopsis, 39. 
Dekay, Zool. of New York, parti. 194, 20, 242. 
Chenu, Conchy!. Unio, pl. 20, fig. 2. 
o9 
