HIGH SCHOOL ZOOLOGY. 



67 



bass, one of which, the Striped bass {Roccus lineatus), is much 

 valued as a food fish, and is represented in our inland waters 

 by the white bass R. chrysoi^s (Fig. 35). Both of them are 



Fig. 35.— The White Bass. Roccua chrysops. |. 

 (U. S. F. C.) 



marked by blackisli longitudinal lines, which are more distinct 

 and continuous in the former species. The pseudobranclis are 

 large and the dorsal fins nearly or quite separate. 



21. Of the other numerous marine forms of Acanthopteri, 

 the following may be mentioned as of interest, the Mackerel 

 Scomber scombrus (Fig. 36) with its numerous doi-sal and anal 



Fig. 36.— The Mackerel. Scomber scombrus. J. 

 (U. S. F. C.) 



finlets, the Tunny Orcijnus thynnus (Fig. 37) one of the largest 

 of Teleosts, the Sword-fish (Xiphias glaclius) (Fig. 38) with its 

 upper jaw prolonged into a sword, and the Sucker ( Echeneis 

 remora) (Fig. 39) whose dorsal fin is converted into a sucking 

 disc by which the fish attaches itself to moving bodies. A 



