PLATE XIX. 



Nemodon Vancouverensis, Meek, Sp. (page 168.) 



Figure I. Left valve of a fine adult specimen. 



" 1 a. Interior of a light valve, showing the hinge dentition. 



OucuLL.EA (Idonearca) truncata, Gabb (page 165.) 



Figure 2. Specimen in which the posterior side i.s unusually short and truncated 

 almost vertically at its extremity. 

 " 2 a. Another example whcse posterior side is produced and truncated very 

 obliquel)^ at its margin. This is the form of the species wJiich is 

 most like Meek's figure of C. Nebrasccnsis, Owen. 



Mactra (Cymbophora ?) W.uiuEN.vN.A. -Mcck' it Ilin-clcu (])agc 142.} 



Figure 3. Left valve, side view. 



" 3 a. Eight valve of another specimen. 



Cytherea (C,\llista) laciniata, Stolii-zka (page 148) 



Figure 4. TiCft valve. 



" 4 a. Sculpture of the same, magnified. 



