PATAGONIAN EXPEDITIONS : PAL/EONTOLOGY. 



EXPLANATION OF PLATE XIX. 



PAGE 



Fig. i. OSTREA INGENS Zitt. ......... 99 



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. 



\b. Inner view of lower valve of a very elongate individual 

 (form O. bourgeoisi Phil, or philippii Ortm.) ; Punta 

 Arenas. 

 \c. Inner view of lower valve of a very young individual ; 



Upper Rio Chalia. 

 Fig. 2. PECTEN PIUENUNCIUS v. Ih. . . . . . . . 115 



Patagonian beds. 



20,. Outer view of a right valve ; Mouth of Santa Cruz River, 

 2b. Outer view of a left valve ; Darwin Station, San Julian. 



All the figures are natural size. 



(VOL. iv) 



