1853.] - 253 



Unio nervosus, Raf. Ann. v. 30. Poulson's Trans. 22. 

 Say, Amer. Conch. Synonym, of Unio, No. 6. 

 U. zigzag, Lea, iii. 440, 12, 19. Synopsis, 24. 

 U. Donaciformis, iii. 267, 4, 3. Synopsis, 24. 



nigellus, Lea, x. 283, 24, 42. Synopsis, 30. 



niger, Raf. Ann. v. 2f). (Elliptio,) Poulson's Trans. 15. 

 Co7i. Monog. 49, 26. 

 Fer. Guerin's Mag. 1835, 27. 

 Li. tier's Conch, pi. 150, fig. 5. 

 U. incrassatus, Z/^a, 1842, viii. 217, 16, 34. Synopsis, 24. 



Chenu, Conchyl. Unio, pi. 31, fig. 5. 

 U. gibber, (?) Lea. 



nigerrimus, Lea, 1852, x. 268, 18, 23. Synopsis, 31. 



nigrinus, Lea^ x. 284, 24, 44, Synopsis, 39. 



nitens. Lea, viii. 205, 12, 19. Synopsis, 29. 

 Chenu, Conchyl. Unio, pi. 28, fig. 5. 



nodiferus. Con., (g) Journ. Acad. Nat. So. second ser. i. 277, 38, 4, 8. 

 U. prasinus, Lea, (not Co?i.) Synopsis, 22. 



nodulatus, Raf. Ann. v. 41,81, 17, 18- Poulson's Trans. 42. 

 Say, Amer. Conch. Synonym, of Unio, No. 6. 

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



U. pustulatus. Lea, 1832, iv. 79,7, 9. Synopsis, 22. 

 Chenu, Conchyl. Unio, pi. 15, fig. 8. 



notatus, Lea, 1838, vi. 28, 8, 22, Synopsis, 29. 



Novi-tboraci, Lea, 1838, vi. 104, 24, 114, Synopsis, 27. 

 Dehay, Zool. of New York, 194, 20, 240. 

 Chenu, Conchyl. Unio, pi. 19, fig. 5. 



nucleopsis, Cori.., Journ. Acad. Nat. Sc. 2d ser. i. 276, 37, 8. 

 Lea, Synopsis, 35. 



nexus, )Sy, Transylvania Journ. 1831, iv. 527. Amer. Conch. 51. 

 Con. xMonog. 68, 38, 1 . 

 Ferussac, Guerin's p. Mag. 28. 

 U. arcaeformis. Lea, 1832, iv. 116, 17,44, Synopsis, 23. 



notatus, Lea, 1838, vi. 28, 8, 22, Synopsis, 29. 

 Chenu, Conchyl. Unio, pi. 21, fig. 3. 

 U. simus, Lea, vi. 26, 8,20. 

 Chenu, Conchyl. Unio, pi. 21, fig. 4. 



obliquus, Lam. An. sans Vert. vi. 72. 

 Con. Monog. 77, 43, 2. 

 U. obliquus, Fer. Guerin's Mag. 1835. 

 U. ebenus. Lea, 1832, iv. 84, 9, 14. Synopsis, 35 



Chenu, Conchyl. Unio, pi. 15, fig. 7. 

 U. undatus, Desh. (not Barnes) Desh. ed. of Lam. vi. 534. 

 U. mytiloides, (.?) Swain, {not Raf.) 43, Malac 270, fig. 53. 



obliquatus, i2/. (obliquaria) Ann. v. Poulson's Trans. 46. 

 Say, Amer. Conch. Synonym of Unio, No. 33. 

 U. ridibundus. Say, Disseminator. 

 U. sulcatus. Lea, iii. 430, 8, 12, Synopsis, 26. 

 Chemi, Conchyl. Unio, pi. 13, fig. 3. 



obovalis, J2(7/. v. 45, Poulson's Trans. 49. 

 U. solidus, Lra, vi. 13, 5, 13, Synopsis, 25. 

 Chenu, Conchyl. Unio, pi. 25, fig. 2. 



*obtusus. Lea, viii. 201, 11, 13, Synopsis, 39. 

 Chenu, Conchyl. Unio, pi. 31, fig. 2. 



occidentalis. Con. Monog. 64, 36, 1. 

 Lea, Synopsis, 33. 



