ANODONTA. 503 



opaca, Lea. Stewartiana, Lea. 



Oregonensis, Lea. subcrassa, Lea. 



ovata, Lea. suborbiculata, Say. 



pavonia, Lea. subvexa, Com: 



penicillata, Gray. sulcosa, Conr. 



Pensylvanica, Lam. tetragona, Lea. 



Pepiniaua, Lea. trigona, Spix. 



plana, Lea. Troutwiniana, Lea. 



Puelchana, D'Orb. undulata, Say. 



purpurea, Valenc. uniopsis, Lam. 



salmonia, Lea. virens, Lea. 



SchaefFeriana, Lea. viridis, Lea. 



Sedakowii, Siem. Wardiana, Lea. 



Sub-gen. symphynota, Lea. 



Shell symphynote or with the hinge-margin winged, trigonal 

 or ovate ; surface of valves smooth or plicate. 



Benedicteusis, Lea. Nuttalliana, Lea. 



Californiensis, Lea. tortilis, Lea 



crispata, Lam. Wahlamatensis, Lea. 



magnifica, Lea. Woodiana, Lea. 



Sub-gen. lamproscafha, Swainson. 



Shell not winged, elongate, pod-shaped; beaks near the ante- 

 rior extremity. Teeth none. 



arcuata, Firm. Schroteriana, Lea. 



Buchanensis, Lea. sinuosa, Lam. 



cylindracea, Lea. soleniformis, D'Orb. 



elongata, Swains. solidula, Dev. and Hup. 



ensiformis, Spix. subcylindracea, Lea. 



exilis, Lea. tenebricosa, Lea. 



gracilis, Lea. tenuis, Lea. 



lucida, D'Orb. Whcatleyi, Lea. 

 Maryattana, Lea 



