258 [Feeruaky, 



Unio stapes, Lea, 1832, iv. 77, 7, 8, Synopsis, 22, 

 Co7i. Monog. 83, 46, 1. 

 Fer, Guerin's Mag. 1835, 28. 

 Cheyniy Conchyl. Unio, pi. 15, fig. 5. 



stegarius, Raf. Ann. v. 46, Poulson's Trans. 51. 



Con. Monog. 83, 46, 1. 



Fer. Guerin's Mag. 1835, 28. 



U. irroratus. Lea, 1852, iji. 269, 5, 5, Synopsis, 22. 



Che7iu, Conchyl. Unio, pi. 10, fig. 3. 



Stewardsonii, Lea, 1852, x. 278, 23, 36, Synopsis, 20. 



Stonensis, Lea, viii. 195, 8, 5, Synopsis, 27. 



stramineus, Co7i. Sillim. Journ. xxv.339, 1, 6. 

 Monog. 91, 50, 1. 

 Lea, Synopsis, 28. 



striatus. Lea, 1841, viii. 203, 12, 16, Synopsis, 26. 



strigosus. Lea, 1841, viii. 198, 9, 9, Synopsis, 36. 

 Chenu, Conchyl. Unio, pi. 30, fig. 6. 



subinflatus. Con, New Fresh Water Shells, Appendix, 1835, 5. 

 Monog. 97, 54, 1. 

 U. Hopetonensis ? iea,lS38, vi. 29, 9, 24, Synopsis, 32. 

 CAe?i7, Conchyl. Unio, pi. 20, 5. 



subplanus. Con, Monog. 73, 41, 1. 

 Lea, Synopsis, 33. 

 subrotundus, Faf, (young) Ann. 42, Poulson's Trans. 44. 

 Say, Amer. Conch. Synonym, of Unio, No. 32. 

 Fer. Guerin's Mag. p. 28. 

 U. striatus, Faf. (old) Ann. v. 45, Poulson's Trans. 50. 



circulus, Lea, iii. 433, 9, 14, Synopsis, 34. 

 Chenu. Conchyl. Unio, pi. 16, fig. 1. 



subtentus, Say, Journ. Acad. Nat. Sc. v. 130, Amer. Conch, pi. 15. 

 Con. Sillim. Jour. xxv. 339, 1, 4, Monog. 85, 47, 1. 

 Fer. Guerin's Mag. 1835. 

 Lea, Synopsis, 21. 



subrostratus, Sy, Disseminator, 1830. 



U. iris. Lea, iii. 439, 11, 18, Synopsis, 38. 

 Chenu, Conchyl. Unio, pi. 8, fig. 7. 



symmetricus. Lea, 1845, x. 73, 4, 11, Synopsis, 32. 



Tampicoensis, iga, vi. 24, 7, 18, Synopsis, 26. 

 Chenu, Conchyl. Unio, pi. 21, fig. 5. 



taeniatus. Con. New Fresh Water Shells, 26, 4, 2. 

 U. pulcher. Lea, vi. 6, 3, 6, Synopsis, 28. 

 Cltenu, ConchyL Unio, pi. 17, fig. 2. 



Taitianus,*^ ica, 39,4,11, Synopsis, 25. 

 Tecomatensis, Lea, 1841, viii. 234, 21, 48, Synopsis, 27. 

 Chenu, Conchyl. Unio, pi. 31, fig. 6. 



Tennesseensis, Lea, 1842, viii. 199, 10, 11, Synopsis, 27. 

 Chemi, Conchyl. Unio, pi. 27, fig. 1. 



tener. Lea, 1842, viii. 198, 10, 10. Synopsis, 28. 

 Chetiu, Conchyl. Unio, pi. 31, fii. 1. 



tenerus, Ravenel, Lea, 1834, v. 63, 9,2. Synopsis, 39. 

 U. tenebrosus. Con. New Fresh Water Shells, 42, 7, 1. 



tetralasmus, Sni/, Amer. Conch, pi. 23. 

 Lea, Synopsis, 32. 



