PLATE V. 



LiTiiODOMUS Canadensis (page 54). 



Figure 1 . Right valve, 



Platyostoma affinis (page GO). 



Figure 2. A cast of the inferior. 



Pleurotomaria Delta (page 61). 



Figure 3. A cast of the interior. 



Pleurotomaria Lydia (page 62). 



Figure 4. Left side of a cast. 

 " Act. View of the spire. 



Pleurotomaria Voltumna (page 61) 



Figure 5. Posterior side of a cast. 

 " 5«. View of the spire. 



MuRCJiisoNiA ITebe (page 57). 



Figure G. Cast of th(? Inferior. 



MuRCiiisoNiA EGRTlaiA (page 58). 



Figure 7. Cast of the interior. 



Belleropiiox plexus (page 02). 



Figure 8. Dorsal view. 

 8(;. Side. 

 Si. Fron^ 



