88 NON-MARINE FOSSIL MOLLUSCA. 



PLATE 4. CRETACEOUS. 

 Margaritana nebrascensis Meek & Hayden. (Page 21.) 



Fig. I. Left side view, natural size. 

 Fig. 2. Dorsal view of the same. 



Cyrena dakotensis M. & H. (Page 30. ) 



Fig. 3. Left side view, natural size. 



Fig. 4. Dorsal view of the same. After Meek. 



Phtsa ? (Page 38.) 



Fig. 5. Lateral view of an imperfect natural cast, natural size. 



