PLATE IV. 



Pterinea textilis ? 



Figure 1. Supposed to be Avicula textilis, Hall ; Pal, N. Y., vol. 3. 



Mytilarca Canadensis (page 52). 



Figure 2. Left side of a cast. 

 " 2a. Anterior side of the same. 



Grammysia Canadensis (page 51). 



Figure 3. Left valve. 



MoDiOMORPiiA INORNATA (page 52). 



Figure 4. Right valve. 



Sanguinolites Tethys (page 50). 



Figure 5 Right side of a cast. 

 " 5a Hinge view of the same 



