Trs. Am. P. S., v. 4, pi. 18, f. 45. 

 Fouls. Transl. Raf., p. 44. 

 Trs. Am. P. S., v. 3, pi. 9, f. 14. 

 Trs. Am. P. S., v. 4, pi. 8, f. 10. 

 Amer. Conch., pi. 15. 

 Conr. Mon., p. 85, pi. 47, f. 1. 

 Mich. Supp., pi. 16, f. 23. 

 Trs. Am. P. S., v. 3, pi. 8, f. 12. 

 Delessert, pi. 12, f. 3. 

 Trs. Am. P. S., v. 9, pi. 42, f. 1 1. 

 Sovverb. Gen. of Shells, f. 1. 

 Trs. Am. P. S., v. 6, pi. 7, f. 18. 

 Trs. Am. P. S., v. 6, pi. 17, f. 55. 

 Proc. Bost. S. N. H., v. l,p. 140. 

 N. F. W. Shells, p. 42, pi. 7, f. 1. 

 Clienu C. II!., pi. 31, f. 1. 

 Trs. Am. P. S., v. 3, pi. 11, f. 21. 

 Conr. Mon., p. 52, pi. 28. 

 Pouls. Trans. Raf., p. 68, sp. 66. 

 Amer. Conch., pi. 23. 

 Cuv. R. An.par Desh.,pl. 92,f.l. 

 Conr. Mon., p. 50, pi. 27, f. 1. 

 Conr. Mon., p. 110, pi. 60, f. 2. 

 Trs. Am. P. S., v. 4, pi. 3, f. 1. 

 Amer. Conch., pi. 33. 

 Reeve Syst. C., pi. 89, f. 9. 

 Trans. A. P. S., v. 4, p. 110. 

 Pouls. Transl. Raf., p. 31. 

 Sillim. Jour., v. 6, p. 272. 

 Trs.Am.P. S.,v.4,pl. 16,f.41. 

 Trs. Am. P. S., v. 5, pi. 10, f.30. 

 Amer. Conch., pi. 67. 

 Pouls. Transl. Raf., p. 31. 

 Conr. Mon., p. 43, pi. 22. 

 Ann. Gen. des S. P., v. 5, p. 42. 

 Sillim. Jour., v. 6, p. 123. 

 Enc. Meth., pi. 248, f. 9. 

 Rossm., p. 117, pi. 7, f. 70. 

 Trs. Am. P. S., v. 6, pi. 5, f. 11. 

 Cat. de Corse, p. 65, pi. 2, f. 2, 3. 

 Conr. Mon., p. 77, pi. 43, f. 2. 

 Conr. Mon., p. 107, pi. 59. 

 Sillim. Jour., v. 6, pi. 4, f. 4. 

 Amer. Conch., pi. 16. 

 Sillim. Jour., v. 6, pi. 2, f. 2. 

 Trs. Am. P. S., v. 6, pi. 11, f. 31. 



13 Unio politus, Say. 

 Unio circulus, Lea. 



Unio lens, Lea. 



Unio littoralis? Lam. 



is Unio obliquatus, Raf. 



is Unio complanatus, Soland. 



is Hyria avicularis, Lam. 

 Unio viridis, Conrad 



Unio tenerus, Rav. 

 is Unio tenebrosus. Conr. 

 is Unio leptodon, Raf. 

 Unio anodontoides, Lea. 



is Unio retusus, Lam. 

 is Unio gibbosus, Raf. 

 is Unio Troostensis, Lea. 



Unio interruptus, Say. 

 is Unio triqueter, Raf. 

 is Unio cordatus, Raf. 

 Unio triangularis, Barnes. 

 Unio cuneatus, Swains. 

 Unio formosus, Lea. 

 Unio trabalis, Conr. 

 Unio elegans, Lea. 



Unio verrucosus, Barnes. 

 Unio tuberculosa, Val. 

 is Unio tuberculatus, Raf. 

 is Unio ovalis, Flem. 

 is Unio ovalis, Flem. 

 Unio Mortoni, Conr. 

 is Unio pictorum, Lam. 

 is Unio cordatus, Raf. 

 is Unio heros, Say. 

 is Unio cordatus, Raf. 

 is Unio plicatus, Say. 

 is Unio costatus, Raf. 



