Synopsis Fresh-Wati;r Moli^usca 



77 



Subgenus EURYNIA s. s. 



Shell usually of good size, subelliptical, elongated, more or less pointed 

 beltind; beak sculpture double-looped, the posterior loop often open behind. 



Fig. 2IO 



sa 



mp 



Fisf. 211 



Inner edge of the mantle in the female in front of the branchial open- 

 ing with a long row of quite regular, uniform, subequal papilla', reaching 

 to about the middle of the lower margin. 



Type: Unio recta Lam., fig. 210. Animal, fig. 211. 



