PATAGONIAN EXPEDITIONS : PALAEONTOLOGY. 
EXPLANATION OF PLATE XIX. 
Fig. I. OSTREA INGENS Zitt. ......... 
Patagonian beds. 
i a. Outer view of lower valve of a specimen of medium size, 
representing the form O. hatcheri Ortm. ; mouth of Santa 
Cruz River. 
ib. Inner view of lower valve of a very elongate individual 
(form O. bourgeoisi Phil, or philippii Ortm.) ; Punta 
Arenas. 
i c. Inner view of lower valve of a very young individual ; 
Upper Rio Chalia. 
Fig. 2. Pecten pRaEnuncius v. Ih. 
Patagonian beds. 
2 a. Outer view of a right valve ; Mouth of Santa Cruz River. 
2 b. Outer view of a left valve ; Darwin Station, San Julian.. 
All the figures are natural size. 
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