494 NON-MARINE FOSSIL MOLLUSCA. 



PLATE 4. CEETACEOUS. 

 MARQARITANA NEBRASCENSIS Meek & Hayden. (Page 427. ) 



FIG. 1. Left side view, natural size. . 

 FIG. 2. Dorsal view of the same. 



CYRENA DAKOTENSIS M. & H. (Page 436. ) 



FIG. 3. Left side view, natural size. 



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



PHYS A ? (Page 444 .) 



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



