1863.] 259 



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. 

 Cheuu, Conchyl. Unio, pi. 14, 3. 



trabalis. Con. New Fresh Water Shells, Mav, 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, 1812, viii. 204, 12, 17, Synopii.- 24. ( 



Chenity Conchyl. Unio, pi. 29, fig. 6. 



torulosus, Raf. (obliquaria) Ann. v. 48, Poul son's Trans. 56. 

 Fer., Guerin's Mag. 1835, p. 28. 

 Kast., Chemn. Unio, 28, 4, 3, 4. 

 Say, Amer. Conch. Synonym, of Unio, No. 40. 

 U. gibbosus, Raf., Con. Monog. 50, 27. 

 Kitst. Chemn. Unio, 28, 4, 3, 4. 

 U. perplexus, Lea, iv. 122, 17, 42, Synopsis, 23. 

 Chenu, pi. 18, fig. 5. 



triqueter, Raf. Ann. v. 34, Poulson's Trans. 31. 

 IT. triangularis, Barnes, vi. 272, fig. 17. 

 U. formosus, Z/i?, iv. Ill, 16,41. 

 Chenu, Conchyl. Unio, pi. 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. 

 Chemc, Conchyl. Unio, pi. 15, fig. 3. 



trossulus. Lea, ix. 278, 40, 6, Synopsis, 25. 



tuberosus. Lea, 1842, viii. 210, 14, 25, Synopsis, 22. 

 Che7itc, pi. 28, fig. 7. 



tumescens, Lea, 1845, x. 71, 3, 7. Synopsis, 25. 



undatus, {n) 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, pi. 19, fig. 3. 



Vaughnianus, Lea, vi. 5, 3, 5, Synopsis, 38. 

 Chemc, Conchyl. Unio, pi. 21, fig. 1. 



velatus. Con., 1853, Journ. Acad. Nat. Sc. iii. 2d series. 



venustus, Lea, 1838, vi. 4, 2, 4, Synopsis, 27. 

 Chenu. Conchyl. Unio, pi. 22, fig. 1. 



verrucosus, Raf. Ann. v. 42, Poulson's Trans. 44. 

 U. tuberculatus, J5a;-e.5, Sillim. Journ. vi. 

 Hildreth, Sillim. Jour. xiv. 281, fig. 8. Lea, Synopsis, 23. 



viridis, (o) Raf. Ann. v. 27, Poulson's Trans. 19. 

 Con., Monog., 36, 17, 1. 



U. Tappanianus, Lea, vi. 62, 17, 55, Synopsis, 39. 

 Delay, Zool. of New York, part i. 194, 20, 242. 

 Chemi, Conchyl. Unio, pi. 20, fig. 2. 



