PATAGONIAN EXPEDITIONS ! 
PALEONTOLOGY. 
EXPLANATION OF PLATE XVIII. 
PAGE 
Fig. I. Ostrea INGENS Zitt. 99 
Cape Fairweather beds ; Cape Fairweather. 
i a. Inner view of lower valve. 
ib. Inner view of upper valve of same individual (showing 
crenulations near the area). 
Both figures natural size. 
(VOL. IV) 
