PATAGONIAN EXPEDITIONS : PALAEONTOLOGY. 



EXPLANATION OF PLATE XVI. 



PAGE 

 Fig. I. OSTREA INGENS Zitt. 99 



Patagonian beds ; mouth of Santa Cruz River. (The same individual 

 as that figured on plate XV.) 



i a. Inner view of lower valve. 

 id. Inner view of upper valve. 



Both figures natural size. 



(VOL. iv) 



