PATAGONIAN EXPEDITIONS : PALEONTOLOGY. 



EXPLANATION OF PLATE XXIII. 



PAGE 



Fig. i . PECTEN cf. CENTRALIS Sow. . . . . . . . . 1 1 6 



Patagonian beds ; Port Desire. 

 i a. Right valve. 



i b. Left valve of the same individual. 

 Note. Both valves in fragments; in fig. \b the fragments have not been 



imbedded quite correctly in the plaster. 

 Fig. 2. PECTEN GEMINATUS Sow. . . . . . . . . 117 



Patagonian beds. 



2a. Small right valve, agreeing with Sowerby's type ; Oven 



Point, San Julian. 

 zb. Small left valve of another individual ; Oven Point, San 



Julian. 



zc. Larger right valve ; Oven Point, San Julian. 

 zd. Right valve of var. quemadensis v. Ih. ; Darwin Station, San 



Julian. 

 ze. Lateral view of both valves, the same individual as fig. zd. 



All the figures are natural size. 



(VOL. iv) 



