64 
216. 
217. 
218. 
219. 
220. 
221. 
222. 
223. 
224. 
225. 
226. 
227. 
U. 
Spee ere; ye Cre c 
228. U 
229. 
230. 
231. 
232. 
233. 
234. 
235. 
236. 
237. 
238. 
239. 
240. 
O41. 
242. 
243. 
244. 
245. 
246. 
247. 
NAIADES. 
securus, Lea, Obs. Unio. p. 51. pl. 11. 17. 
Unio depressus, Rafinesque (not Lamarck); Unio lineo- 
latus, Rafinesque. 
- semigranosus, Philippi, Mag. Zool. 1843. p. 118. 
. Sheppardianus, Lea, Trans. Amer. Phil. Soc.v. 5. pl. 13. f.38. 
. simus, Zea, Obs. Unio. v. 2. p. 26. pl. 8. f. 20. 
- solidus, Lea, Trans. Amer. Phil. Soc. v. 6. pl. 5. f. 13. 
. Sowerbianus, Lea, Trans. Amer. Phil. Soe. v. 5. pl. 10. f. 28. 
- spinosus, Zea, Trans. Amer. Phil. Soc. v. 6. pl. 16. f. 50. 
. splendidus, Zea, Trans. Amer. Phil. Soc. v. 6. pl. 19.f. 61. 
. stapes, Zea, Trans. Amer. Phil. Soe. v. 4. pl. 7. f. 8. 
. stramineus, Conrad, Silliman’s Journ. p. 25. pl. 1.f.6. 
. subeylindraceus, Zea, Trans. Am. Phil. Soc.v.6.pl.24.f.117. 
U. 
subovatus, Zea, Trans. Amer. Phil. Soe. v. 4. pl. 18. f.46. 
- subrotundus, Zea, Trans. Amer. Phil. Soc. v. 4. pl. 18. f. 45. 
Unio politus ? Say ; Unio brevialis? Crouch. 
. subtentus, Say, Amer. Conch. pl. 15. 
. subtetragonus, Michaud, Compl. de Draparnaud, pl. 16. f. 23. 
- sulcatus, Lea, Obs. Unio. p. 44. pl. 8. f. 12. 
Unio ridibundus, Say. 
. Swananoensis, Lea, Trans. Am. Phil. Soe. v. 5. pl. 17. f. 50. 
Margaritina Raveneliana, Lea. 
. teniatus, Conrad, Freshwater Shells, p. 26. pl. 4. f. 2. 
. Tahitianus, Zea, Trans. Amer. Phil. Soc. v. 5. pl. 4. f.11. 
. Tampicoensis, Zea, Obs. Unio. v. 2. p. 24. pl. 7. f. 18. 
. Tappianus, Zea, Trans. Amer. Phil. Soc. v. 6. pl. 17. #. 55. 
. Tavoyensis, Gould, Pro. Bost. Soc. Nat. Hist. 1843. p.140. 
. tener, Ravenel, Conrad’s Freshwater Shells, p. 42. pl. 7. f.1. 
. tenuissimus ( Symphynota), Lea, Tr. A. P. S.v. 3. p.11. f. 21. 
Anodonta purpurascens, Swainson ; Unio velum, Say. 
. tetralasmus, Say, Amer. Conch. pl. 23. 
. tragosus, Conrad, Monog. p. 12. pl. 6. f. 2. 
. trapezoides, Zea, Trans. Amer. Phil. Soe. v. 4. pl. 3. f. 1. 
(var.) Unio crassidens, Lamarck ; Unio interruptus, Say. 
. triangularis, Barnes, Silliman’s Journ. vy. 6. p. 272. pl.13.f17. 
Unio formosus, Lea; Unio cuneatus, Swainson. 
. trigonus, Zea, Trans. Amer. Phil. Soe. v. 4. pl. 16. f. 40. 
. Troostensis, Lea, Trans. Amer. Phil. Soc. v. 5. pl. 10. f. 30. 
Unio trabilis, Conrad. 
. truncatus, Swainson, Zool. Illus. 2nd series. 
. tuberculatus, Barnes, Silliman’s Journ. v. 6. pl. 7. f. 8. 
