252 
Unio lugubris, Lea, vi. 30, 9,25, Synopsis, 38. 
Chenu, Conchyl. Unio, pl. 20, fig. 3. 
maculatus, Con. New Fresh Water Shells, May, 1834, 
Lea, Synopsis, 24. 
U. Ravenelianus, Lea, Aug. 1834, v. 32, 3, 5. 
Masoni, Con. Monog. 28, 12, 2. 
Lea, Synopsis, 34. 
Kust. Chem. Unio, pl. 5, fig. 6. 
meestus, Lea, 1841, vill. 244, 26, 60. Synopsis, 31. 
Chenu, Conchyl. Unio, pl. 28, fig. 3. 
merus, Lea, 1852, x. 260, 15,10. Synopsis, 33. 
Menkianus, Lea, 1838, vi. 76, 19,59, Synopsis, 27. 
Chenu, Conchyl. Unio, pl. 19, fig. 4. 
Metallicus, Say, Dissem. 1830. 
Amer. Conch. Synonym. of Unio, No. 51. 
| FEBRUARY, 
30,4, 4. 
U. cuprinus, Lea, 1834, iv. 94, 12,24. Synopsis, 38. 
Chenu, Conchyl. Unio, pl. 11, fig. 3. 
metanever, Raf. Ann. v. 39. Poulson’s Trans. 39. 
Fer., Guerin’s Mag. 1835, 27. 
U. metanevrus, Say, Amer. Conch. Synonym. of Unio, 24. 
Con., Monog. 10, 5, 2. 
Kust. Chemn. Unio, pl. 10, fig. 4. 
U. nodosus, Barnes, Sillim. Journ. vi. 124, 6, 7. 
U. rugosus, (?) ib. ib. vi. 126, 8, 9. 
U. metanever, Lea, Synopsis, 22. 
minor, Lea, 1846, ix. 276, 39,2. Synopsis, 31. 
Mississipiensis, Coz., Journ. Acad. Nat. Sc. ii. 277, 38, 11. 
Lea, Synopsis, 29. 
Mortoni, Con., Monog. Dec. 1835, 11, 6, 1. 
Kust. Chemn. Conchyl. Unio, pl. 11. fig. 1. 
U. turgidus, Lea, 1837, vi. 11,5, 11. 
Chenu, Conchyl. Unio, pl. 25, fig. 1. 
Muhlfeldianus, Lea, 1838, vi. 41, 12,36. Synopsis, 30. 
Chenu, Conchyl. Unio, pl. 17, fig. 5. 
Monroensis, Lea, 1841, ix. 279,41, 8. Synopsis, 29. 
Moussianus, Lea, 1852, x. 268, 18, 22. Synopsis, 29. 
Nashvillianus, Lea, 1834, v. 100, 14,43. Synopsis, 29. 
nasutus, Say, Nicholson’s Ency. article Conch. pl. 4, fig. 1. 
Lister’s Conch., t. 151, fig. 6. 
Con. Monog. 38, 18, 1. 
Gould, Invert. of Mass, 109. 
Dekay, Zool. of New York, 191, 20, 239. 
Lea, Synopsis; 37. 
Mya nasuta, Wood., Index Test. Sup. pl. 1, fig. 4. 
U. rostratus, Valenc. Humb. and Bonpl., 11. 223, 53, 3. 
Eurinea nasuta, Agas. Stimpson’s Shells of New England, 13. 
*nebulosus, Coz. New Fresh Water Shells, 28, 3, 7. 
neglectus, Lea, 1846, ix. 280,42, 10. Synopsis, 33. 
nexus, Say, Transyl. Journ. 1831, fv. 527. 
Amer. Conch. pl. 51. 
Con. Monog. 68, 38, 1. 
Fer. Guerin’s Mag. 1835, 28. 
U. arceformis, Lea, 1832, iv. 116, 17,44. Synopsis, 13. 
Chenu, Conchyl. Unio, pl. 12, fig. 3. 
