U. S. NATIONAL MUSEUM 



PROCEEDINGS, VOL. 52 PL. 8 



POLYRHIZODUS GRANDIS, DELTODUS OCCIDENTALIS, POLYRHIZODUS CONCAVUS, DIP- 

 TERUS ANGUSTUS, POLYRHIZODUS GRANDIS, CHOMATODUS, SPECIES, CLADODUS 



spinosus, and Dinichthys PUSTULOSUS. 



For explanatjon of plate see pages 299 and 300. 



