NAIADES. . 65 



248. U. tuniidiis, Retz, Rossmiisler's Icon. pi. 70. f. 202-204. 



Ml/a ovata, Donovan ; My sea solida, Turton ; 

 Unio nodulosa, Lamarck. 



249. U. turgidus, Lea, Trans. Amer. Phil. Soc. v. 6. pi. 5. f. 11 . 



Unio Mortoni, Conrad. 



250. U. Turtoni, Payrandeau, Cat. Moll.de Corse, p. 65. pi. 2. f. 2, 3. 



251. U. undulatus {Alasmodonta'), Say, Amer. Conch, pi. 16. 



Margaritina tmdidata, Lea ; Mya undidata, Wood ; 

 Alasmodonta sculpiilis (Young), Say ; Unio glabrutus, 

 Sowerby. 



252. U. undulatus, Barnes, Silliman's Journ. v. 6. pi. 2. f. 2. 



Unio costafus, Conrad. 



253. U. Vanuximensis, Zea, Trans. Amer. Phil. Soc. v.6.pl.ll.f.31. 



254. U. variabilis (Mya), Maton, Linn. Trans, v. 10. pi. 24. f. 4-7. 



Unio rotundus, Wagner. 



255. U. varicosus, Lea, Trans. Amer. Phil. Soc. v. 4. pi. 11. f. 20. 



Unio cicatricosus ? Say. 



256. U. Vaughanianus, Lea, Obs. Unio. v. 2. p. 5. pi. 3. f. 5. 



Unio Caroline7isis, Ravenel. 



257. U. venustus, Lea, Obs. Unio. v. 2. p. 4. pi. 2. f. 4. 



258. U. verrucosus, Barnes, Silliman's Journ. v. 6. pi. 5. f. 6. 



Unio tuherculosus, Valenciennes ; 

 Unio tuberculatus, Conrad. 



259. U. vibex, Conrad, Freshwater Shells, p. 31. pi. 4. f.3. 



260. U. Zeiglerianus, Lea, Obs. Unio. v. 2. p. 32. pi. 10. f. 27. 



261. U. ziczac. Lea, Obs. Unio. p. 54. pi. 12. f. 19. 



Genus II. HYRIA, Lamarck, 



1. H. avicularis, Lamarck, Delessert, Recueil Coq.pl. 12. f. 9. 



Hyria elongata, Svvainson. 



2. H. Browniana ( Unio), Lea, Obs. Unio. v. 2. p. 108. pi. 24. f.l 16. 



3. H. corrugata, Lamarck, Enc. meth. pi. 247- f. 2. 



3Iya angulata. Wood ; Unio corrvgatus, Blainville ; Unio 

 angulatus. Lea ; Paxyodon ponderosus, Schumacher ; 

 Triptodon corrugatum ? Spix. . 



4. H. syrmatophora, Sowerhy, Genera of Shells, no. 16. f. 1. 



Mya syrmatophora, Linnaeus; Unio syrmatophora, Lea; 

 Hyria avicularis (var.), Det^hayes ; Prisodon obliquus, 

 Schumacher; Diplodon fuscatum, Spix. 



