NAIADES. 61 
. marginalis, Lamarck, Enc. méth. v. 2. pl. 247. f. 1. 
Unio anodontina, Linnzus. 
. marginatus ( Alasmodonta), Say, Journ. A. N.S. P.v.1.p.457. 
Margaritina marginata, Lea ; Unio varicosus, Lamarck ; 
Mya rugulosa, Wood. 
. Masoni, Conrad, Freshwater Shells, p. 34. pl. 5. f. 2. 
- medellinus, Lea, Obs. Unio. v. 2. p. 39. pl. 12. f. 34. 
. membranaceus, Lea, Hanley, Species of Shells, p. 202. 
Mytilus membranaceus, Maton ; Unio Matonianus, D'Orb. 
. Menkianus, Lea, Trans. Amer. Phil. Soc. v. 6. pl. 19. f. 39. 
. merdiger, Watts, Jay’s Cat. p. 25. no. 1065. 
. metaniver, Lea, Conrad’s Monog. pl. 5. f. 2. 
Unio metanevrus, Conrad; Unio nodosus, Barnes; Unio 
rugosus, Barnes. 
- Modioliformis, Zea, Trans. Amer. Phil. Soe. v. 5. pl.13. f.40. 
Unio delumbris, Conrad. 
- monodonta, Say, Amer. Conch. pl. 6. 
Unio Soleniformis, Lea. 
. Mihlfeldianus, Zea, Trans. Amer. Phil. Soc. v. 6.pl.36.f.41. 
- multiradiata, Lea, Obs. Unio. p. 48. pl. 9. f. 15. 
Unio fasciolus, Conrad ; Unio ligamentina, Deshayes. 
- multistriatus, Lea, Obs. Unio. v. 1. p. 101. pl. 12. f. 22. 
Diplodon ellipticum ? Spix. 
- Murchisonianus, Lea, Trans. Amer. Phil. Soe. v. 5. pl. 3. f.6. 
Unio Douglasie, Gray. 
. Mytiloides, Deshayes, Enc. méth. pl. 249. f. 4. 
. nana, Lamarck, Anim. sans vert. v. 6. p. 539. 
. Nashvillianus, Zea, Trans. Amer. Phil. Soe. v. 5. pl. 14. f. 43. 
. nasutus, Say, Swainson’s Zool. Illus. 1st series. 
Mya nasuta, Wood ; Unio subrostratus ? Say ; Unio ros- 
tratus, Valenciennes. 
- Nicklinianus, Zea, Trans. Amer. Phil. Soe. v. 5. pl. 1. 
- Nilotica, Caillaud, Voy. a Méroé, v. 2. pl. 61. f. 8, 9. 
. nodulosa, Lea, Wood’s Gen. Conch. pl. 22. f. 1-4. 
Mya nodosa, Wood. 
. notatus, Lea, Obs. Unio. v. 2.p. 28. pl. 8. f. 22. 
- Nove-Hollandiz, Gray, Pro. Zool. Soc. 1834. p. 57. 
- Novi-Eboraci, Zea, Trans. Amer. Phil. Soc. v.6.pl.24.f.114. 
. obesus, Lea, Trans. Amer. Phil. Soc. v.4. pl. 13. f. 26. 
- obliquus, Lamarck, An. s. v. v. 6. p. 534; Sil. J.v.6. pl. 4. f.4. 
Unio undatus, Barnes; Unio trigonus, Say; Unio cor- 
datus, Conrad. 
. obscurus, Lea, Obs. Unio. v. 2. p. 7. pl. 3. f. 7. 
