382 FOSSIL OSTREID^ OF NORTU AMERICA. 



PLATE LVIII. 



OsTBEA GLABRA Meek & Htiyden. (Page 307.) 



Figs. 1,2. — Exterior and interior views of the type specimen; natural 8ize. After 

 Meek. 

 3,4. — Similar views of a lower valve, from Colorado. 



