334 FOSSIL OSTEEID^ OF NOKTH AKEKICA. 



EXPLANATION OF PLATES. 



PLATE XXXIV. 



OSTREA PATEECULA WincheU. (Page 288.) 



Fig. 1. — Interior view of the lower valve of the type specimen ; natural size. 

 2. — Lateral view of the same specimen. After Winchell. 



OsTREA ENGELMAHNI Meek. (Page 289.) 



3. — Exterior view of a lower valve; natural size. 

 4. — Interior view of another example. 



