ISTOMENCLATURE AND MORPHOLOGY. 39 



Tongue moderate and free; thick behind,,, narrow in front; its 

 surface usually smooth. 



Body elongate, ovate-fusiform, somewhat compressed; deepest 

 just behind the ventrals. Scales moderate; smaller on breast and 

 nape. Lateral line following curve of the back. 



Dorsal fin with nine or ten spines; a deep notch between the 

 spinous and soft portions. Anal fin with three spines. Caudal 

 fin eraarginate. 



Pyloric coeca fourteen or more. Air-bladder simple, slightly 

 notched behind. 



CONTRASTED DIFFERENTIAL CHARACTERISTICS.* 



Small-Mouth. Large-Mouth. 



Scales of trunk 



Small (e. g. lat. line, 72-75; Moderate (e. g. lat. line, 65- 



between lateral line, and back, 70; between lateral line and 



11 rows). back, 7% or 8 rows). 



Scales on nape and hreast 

 Much smaller than those of Scarcely (on nape), or not 

 sides. much (on breast) smaller than 



those of sides. 



Scales of cheeks 



Minute (e. g., between orbit Moderately small (e. g., be- 



and preopereulum, about 17 tween orbit and preoperculum, 



rows in an oblique line and about 10 rows in an oblique line 



about 9 in a horizontal one) . and about 5-6 in a horizontal 



Scales of interoperculum uniserial 



Covering only about half the Covering the entire width of 



width of the bone. the bone. 



* On the species of the genus Micropterus (Lac.) or Grystea 

 (Auct.). By Theodore Gill. Pro. Amer. Assn. Adv. Science, 

 xxn, 1873. 



