PATAGONIAN EXPEDITIONS : PALAEONTOLOGY. 



EXPLANATION OF PLATE XVIII. 



PAGE 

 Fig. I. OSTREA INGENS Zitt. ......... 99 



Cape Fairweather beds ; Cape Fairweather. 

 i a. Inner view of lower valve. 



\b. Inner view of upper valve of same individual (showing 

 crenulations near the area). 



Both figures natural size. 



(VOL. iv) 



