Vnlo Retz. contin. 



Synon. contin. 



Limnium (et Lymnium) Oken. 

 Cristaria, Paxyodon, Prisodon /J, et Unio Sohum. 

 ? Margaritana Schum. q. cf. 

 Castalia Lamck. etc. 



Unio, Lampsilis, Metaptera, Truncilla, Plagiola, 

 Proptera, Obliquaria, Obovaria, Pleurobema, 

 Aximedia, Aniblema, Odatelia, EUiptio, Lep- 

 todea, Eurynia, Ellipsaria , Qnadrula, Rotun- 

 daria, Scalenaria, Syntoxia, Diplasma et? Las- 

 migona Rafin. 

 Mysca Turton. 

 Luticola Goldf. 



Diplodon et Tetraplodon Spix. 

 Monocondylea D'Orb. 



Aeglia, Canthyria, Castalia, Cunicula, Hyridella, 

 Iridea, Ligumia, Lymnadea, Megadomus, Mysca, 

 Naia, Naidea, Potamida, Theliderma et Unio 

 Swainson. 

 Margarita Lea. 

 IJnlo Oken 1815. Zool. p. 238. et 1817. Isis p. 1167. (Ty- 

 pus: Unio margaritifer L.) , 



TuRTON 1822. Bivalv. Brit. p. 249. 

 = Margaritana Schum. 

 Vnlo ScHUM. 1817. Essai p. 137. 



Genus arctius circumscriptum, quam Retzianum, se- 

 gregatis 3Iargaritana , Cristaria, Paxyodonte et 

 Prisodonte. Typus: Unio tumidus Retz. 

 Lea 1838. Trans. Amer. phil. Soc. VI. N. S. part 1 . * 

 Obs. II. p. 118. 121. — subgenus Margaritae; 

 inseruntur Paxyodon, Hyria, Castalia, Prisodon. 

 Grav 1842. Syn. Brit. Mua. p. 91. — genus Unio- 



nidarum. 

 Synon. Limnium Oken olim. 

 Mysca Turt. 

 Potomida Swaina. 



