PERCOMOEPHI. 727 



ADDENDA TO PART FIRST. 



The following genei-a and species were received too late for insertion 

 in their proper places in the body of the work. The title of Part First 

 should embrace the Puerco epoch with the Wasatch and Bridger. Its 

 fossils were not known at the time when the printing of the title and fii-st 

 pages of the book were in press. 



PISCES. 



PERCOMOEPHI. 

 PLIOPLARCHUS Cope. 



Amer. Journ. Science and Arts, 1883, May-Jnne. 



The fishes of this genus belong apparently to the Centrai'chine di\'ision 

 of the Percidse, and although the future discovery of the structure of the 

 ventral fins may invalidate this conclusion, I do not anticipate such a result. 

 I am also unable to determine whether there are teeth on the vomer or not. 

 As regards generic affinity, the species do not enter any of the genera now 

 known from American or European tertiary formations, as will be seen 

 from the characters about to be given. They differ from those of the recent 

 genera of Centrarchinse in the entire circular outline of the operculum; 

 and from some of them in the anal fin with five spinous rays originating 

 posterior to the line of the anterior border of the spinous dorsal fin. This 

 new genus I have named "Plioplarchus, with the following diagnosis : 



Family characters, etc. — Mouth bounded above by premaxillary bone 

 only. Branchiostegal rays seven ; possibl}^ eight. Ventral fin commencing 

 below the base of the pectoral. Scales ctenoid. 



Generic characters. — Teeth few, simple, and conic. No indication of 

 large pharyngeal bones. Preoperculum entire posteriorly and at the angle; 

 inferior edge unknown. Operculum rounded, entire. One dorsal fin. Anal 

 fin commencing below middle of spinous dorsal, with five or more spinous 



