HIGH SCHOOL ZOOLOGY. 



65 



ten soft behind (written D, XI, 10), wliile the anal fin is VI, 10. 

 Like tlie other members of the family tlie colouration is some- 

 what brilliant olive-green, tinged with brassy hues and mottled 

 with darker colours. Ctenoid scales of considerable size clothe 

 the body ; there are 56 of these along the lateral line in this 

 species. The pseudobranchs are small, and the intestine short 

 and provided with 7 ]5yloric cceca. 



Fig. 33.— The Rock Bass. AmblopUtes rupestris. J. 

 (U. S, P. C.) 



Besides the Rock Bass several other species of larger size and 

 gamey habits attract the sportsman. These are easily diagnosed 

 by the fin-formula, which for the Grass Bass {Pomoxys sparoides) 

 is D. YII, or YIII, 15; A. VI, 1 7 or 1 8: for several species of Sun- 

 fish, (Lepomis mcritus and gihhosus) D. X, 1 1 ; A. Ill, 9: and for 

 the large- and small-mouthed Black Bass (Jficroptertis salmoides 

 and dolomieu) D. X, 13 ; A. Ill, 11. The two latter are well 

 known game-fishes, and apart from the size of the mouth, may 

 bo distinguished by the scales of the former being 65-70 along 

 the lateral line and 7-8 in a vertical row above the lateral line, 

 while in the latter they are respectively 72-75 and 10-12. 



18. In the nearly allied family of the Percidse, the dorsal 

 fins are not confluent, the anal spines ai"e less numerous, the 

 pseudobranchs are smaller, and the pyloric cceca fewei'. Two 

 well marked groups, distinguished alike by size and habit, are 



