100 NON-MARINE FOSSIL MOLLUSCA. 



PLATE If). LARAMIE. 



Ostrea glabra Meok & Hayden. (Page 15.) 



Fig. 1. Exterior view of an upper valve, from the valley of the South Platte, Colorado. 

 Fig. 2. Interior view of the same. 



Fig. 3. Lower valve of the type of the variety 0. inseouris White; exterior view. 

 Fig. 4. Interior view of the same. 

 Fig. 5. Type specimen of variety O. arcuatilis Meek. 

 (All natural size.) 



