P L A a^ E IX. 



MIOCENE PECTENS. 



riTnless nthenvisi' slated all figiirfs are approximately natural size.] 



Pag-e, 



Fig. 1. I'rclrn { piilliinpirten) propiilKhix Conriui, V. 8. N. M. 3558. Cotype 64 



Exterior of portion of right valve; altitude 100 mm. Astoria formation I^NIioivne), 

 Astoria, Oreg. (M. B. ) 

 Fk). "id. Same specimen and valve as fig. 1 - ^ 



Portion of disk, showing part of tv,o rilis and inrluded iiitersjiace, X 3. (M. B. ,1 

 Fig. 2. Same specimen as fig. 1 *'■! 



Exterior of portion of left valve. 

 Fig. 2a. Same specimen as tii.'. 1 , left valve - 64 



Portion of disk, showing jiart of three ribs and included intersjiaces, X 3. (M. B.) 



162 



