PLATE 26. 
Fig. 1. UNIO ENDLICHI 
a. Right valve of large example; exterior view ; natural size. 
b. Interior view of a smaller left valve. 
Fic. 2. UNIO GONIONOTUS 
a. Right side view; natural size. 
b. Front view of the same example. 
c. Lett side view of a young example; natura! size, 
d. Right side view of the same. 
e. Dorsal view of the same. 
