ICHTHELIIXE. XCII. 231 



1. P. hexacanthus, (C. & V.) Agass. GRASS BASS. Six- 

 SPINED BASS. Depth 2 in length; head nearly 3; snout 

 projecting, forming an angle with the descending pro- 

 file; mouth large, very oblique; fins very large; anal 

 larger than dorsal; bright olive green and silvery; sides 

 and fins much mottled; D. VII, 15; A. VI, 18; lat. 1. 

 41; L. 8. Great Lakes to Delaware R. (Abbott) and 

 S. W.; a handsome fish. 



** Dorsal spines normally 6; body less elevated ; depth about 

 one-third length. (Pomoxys.) 



2. P. annularis, Raf. BACHELOR (Ohio R.) NEW 

 LIGHT (Ky.) CRAPPIE (St. Louis). Depth two-fifths to 



one-third length, scarcely greater than length of head; 

 olivaceous, silvery below; sides with irregular clusters of 

 dusky spots; D. VII (V to VIII), 15; A. VI, 17; lat. 1. 

 43 (39 to 48); L. 10. Mississippi Valley; a food fish of 

 some value; abundant and exceedingly variable. [P. 

 nitidus, Grd. P. storerius, (Kirt.) Gill. P. intermedius, 

 protacanthus and brevicauda, Gill.] 



4. AMBLOPLITES, Rafinesque. ROCK BASS. 

 < Centrarchus, Cuvier. 



1. A. rupestris, (Raf.) Gill. ROCK BASS. GOGGLE 

 EYE. RED EYE. Depth about half length; head more 

 than one-third; eye nearly 4 in head, very large; cheeks 

 scaly; front convex; longest dorsal ray two-thirds depth 

 of head at front of orbit; brassy olive with golden green 

 and blackish markings; a dark spot at base of each scale, 

 which is conspicuous after death, giving a striped appear- 

 ance; D. XI, 11; A. VI, 10; lat. 1. 42; L. 8. Great 

 Lakes and rivers west of the Alleganies; an abundant 

 species. [A. ceneus, (C. & V.) Ag. A. ichtheloides, 

 (Raf.) Ag.] 



2. A. cavifrons, Cope. Depth 2 in length; mouth 



