73 



A L A S M O D O N T A . 



Ala«modonta costata,Rqf. 



complanata, Barnes, 



confragosa, 



edentula, 



marginata, 



margaritifera, 



Say, 

 Say, 

 Say, 



rugosa, Barnes 



Symphynota com- 

 planata, />>«, 



scriptum, Raf 



Unio margaritifera, Ijom. 

 Alasmodon. arcuata, Barnes, 



