NAIADES. 61 



l^O. U. marginalis, Lamarck, Enc. meth. v. 2. pi. 247. f. 1. 

 Unio anodontina, Linnaeus. 



141. U. marginatus (Alasmodonta), Say, Journ. A. N. S. P. v.l . p.457. 



Margaritiiia marginata. Lea ; Vnio varicosus, Lamarck ; 

 Mya rugulosa, Wood. 



142. U. Masoni, Conrad, Freshwater Shells, p. 34. pi. 5. f. 2. 



143. U. medellinus. Lea, Obs. Unio. v. 2. p. 39. pi. 12. f. 34. 



144. U. menibranaceus, Lea, Hanley, Species of Shells, p. 202. 



Mytilus memhranaceus, Maton ; IJnio Matonianus, D'Orb. 



145. U. Menkianus, Lea, Trans. Amer. Phil. Soc. v. 6. pi. 19. f. 39. 



146. U. merdiger. Watts, Jay's Cat. p. 25. no. 1065. 



147. U. metaniver, Lea, Conrad's Monog. pi. 5.f. 2. 



Unio metanevrus, Conrad ; Unio nodosus, Barnes ; Unio 

 rugosus, Barnes. 



148. U. Modioliformis, Lea, Trans. Amer. Phil. Soc. v. 5. pi. 13. f.40. 



Unio delumbris, Conrad. 



149. U. monodonta, Say, Amer. Conch.pl. 6. 



Unio Soleniformis, Lea. 



150. U. Muhlfeldianus, Lea, Trans. Amer. Phil. Soc. v. 6.pl.36.f.41. 



151. U. multiradiata. Lea, Obs. Unio. p. 48. pi. 9. f. 15. 



Uniofasciolus, Conrad ; Unio ligamentina, Deshayes. 



152. U. nmltistriatus, Lea, Obs. Unio. v. 1. p. 101. pi. 12. f. 22. 



Diplodon ellipticum ? Spix. 



153. U. Murchisonianus, Lea, Trans. Amer. Phil. Soc. v. 5. pi. 3. f. 6. 



Unio Douglasice, Gray. 



154. U. Mytiloides, Deshayes, Enc. meth.pl. 249. f. 4. 



155. U. nana, Lamarck, Anim. sans vert. v. 6. p. 539. 



156. U. Nashvillianus, Lea, Trans. Amer. Phil. Soc. v. 5. pi. 14. f. 43. 



157. U. nasutus, Say, Swainson's Zool. lUus. 1st series. 



3Iya nasuta, Wood ; Unio subrostratus ? Say ; Unio ros- 

 tratus, Valenciennes. 



158. U. Nicklinianus, Lea, Trans. Amer. Phil. Soc. v. 5. pi. 1. 



159. U. Nilotica, Caillaud, Voy. a Meroe, v. 2. pi. 61. f. 8, 9. 



160. U. nodulosa, Lea, Wood's Gen. Conch, pi. 22. f. 1-4. 



Mya nodosa. Wood. 



161. U. notatus. Lea, Obs. Unio. v. 2. p. 28. pi. 8. f. 22. 



162. U. Novee-HoUandise, Gray, Pro. Zool. Soc. 1834. p. 57. 



163. U. Novi-Eboraci, Zea, Trans. Amer. Phil. Soc. V.6. pi. 24. f. 114. 



164. U. obesus, Lea, Trans. Amer. Phil. Soc. v. 4. pi. 13. f. 26. 



165. U. obliquus, Lamarck, An. s. v. v. 6. p. 534; Sil. J.v.6. pl.4. f.4. 



U7iio undatus, Barnes ; Unio trigonus, Say ; Unio cor- 

 datus, Conrad. 



166. U. obscurus, Lea, Obs. Unio. v. 2. p. 7. pi. 3. f. 7. 



