NAIADES. 57 



35. U. Capsseformis, Lea, Trans. Amer. Phil. Soc. v. 5. pi. 2. f. 4. 



36. U. carbonarius, Lea, Obs. Unio. v. 2. p. 37. pi. 11. f. 32. 

 37- U. cariosus, Say, Amer. Conch, pi. 3. f. 2. 



JJyiio luteolus, Conrad ; Unio ovatus, Valenciennes ; Unio 

 crassus (old), Say ; Unio carinatus (rayed), Barnes ; 

 Unio ellipticus (young), Barnes. 



38. U. castaneus, Lea, Trans. Amer. Phil. Soc. v. 4. pi. ll.f. 21. 



39. U. Children!, Gray, ? 



40. U. circulus, Lea, Obs. Unio. p. 47. pi. 9. f. 14. 



My a rotunda ? Wood. 



41. U. Clairbornensis, Lea, Obs. Unio. v. 2. p. 105. pi. 24. f. 1 15. 



42. U. clavus, Lamarck, Conrad's Monog. p. 5. pi. 3. f. 1. 



Unio Modioliformis, Say ; Unio scalenius, Rafinesque. 



43. U. coccineus. Lea, Trans. Amer. Phil. Soc. v.6. pi. 5. f. 12. 



Unio catillus, Conrad. 



44. U. complanatus, Lea, Obs. Unio. v. 1. p. 62. 



3Iya complanata, Dillwyn ; Unio purpureus. Say ; U7iio 



rarisulcata, Lamarck ; Unio coarctata, Lamarck ; Unio 



purpurascens, Lamarck ; Unio rhombula, Lamarck ; 



Unio carinifera, Lamarck ; Unio Georgina, Lamarck ; 



Unio glabrata, Lamarck ; Unio sulcidens, Lamarck. 



45. U. complanatus (Alasmodonfa), Barnes, Silliman's Journ. v. 6. 



p. 278. pi. 14. f. 22. 



Symphynota complanata, Lea. 



46. U. compressus (*S'i/////)%«oto), Lea, Trans. Amer. Phil. Soc. v. 3. 



pi. 12. f. 22. 



47. U. confertus, Lea, Trans. Amer. Phil. Soc. v. 5. pi. 16. f. 47. 



Unio modestus, Ferussac. 



48. U. confragosus {Alasmodonta), Say, Amer. Conch, pi. 21. 



Margaritina confragosa, Lea. 



49. U. congaraeus, Lea, Trans. Amer. Phil. Soc. v. 4. pi. 6. f. 4. 



50. U. Conradicus, Lea, Trans. Amer. Phil. Soc. v. 5. pi. 9. f. 23. 



51. U. contradens. Lea, Obs. Unio. v. 2. p. 75. pi. 18. f. 58. 



52. U. Cooperianus, Lea, Trans. Amer. Phil. Soc. v. 5. pi. 8. f. 21. 



53. U. cor, Conrad, Freshwater Shells, p. 28. pi. 3. f. 3. 



54. U. cornutus, Barnes, Silliman's Journ. v. 6. pi. 4. f. 5. 



Uyiio rejlexus, Conrad. 



55. U. Corrianus, Lea, Trans. Amer. Phil. Soc. v. 5. pi. 9. f. 25. 



56. U. Corrientesensis (7tfb^^oco?^d'^/ea), D'Orbigny,Voy.Amer. Sud, 



pi. 68. f. 8-10. 



57. U. corrugatus, Lamarck, Enc. meth. pi. 248. f. 6, 8. 



Mya corrugata, Miiller ; Mya rugosa, Gmelin ; Mya no- 

 dosa ? Gmelin ; Mya spuria, Gmelin. 



