NORTHERN INLAND FISHES. 275 



Scales on nape and breast. 

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



(on breast) smaller than those of 

 sides. 

 Scales of cheeks. 

 Minute {e. g,, between orbit and Moderately small {e. g. between 

 preoperculum, about 17 rows in an orbit and preoperculum, about 10 

 oblique line and about 9 in a hori- rows in an oblique line and about 

 zontal one). 5-6 in a horizontal one). 



Scales of interoperculum uniserial. 

 Covering only about half tlie Covering the entire width of the 

 width of the bone. bone. 



Scales of preofercular limb. 

 None. Developed in an imperfect row 



{f. g., 3-5 in number). 

 Scales on dorsal. 

 Developed as a deep sheath (in- Developed as a low (obsolete) 

 volving last spine) of small scales shallow sheath, and with series 

 differentiated from those on the ascending comparatively little on 

 back, and with series advancing membrane behind the rays (none 

 high up the membrane behind each behind last five or six), 

 ray (except last two or three). 



Scales on anal. 

 Ascending high behind each ray. None (or very few). 



Mouth. 

 Moderate. Large. 



Supramaxillary. 

 Ending considerably in front of Extending considerably behind 

 higher margin of orbit (about under the posterior margin of orbit, 

 hinder border of pupil). 



Rays. 

 Dorsal articulated, 13. Dorsal articulated, 12 (I. ii). 



Anal. III., 10, II. Anal. III., 10. 



Pectoral, i, 16-1, 17. Pectoral i, 14 (i, 13). 



Dorsal fin in front of soft portion. 

 Little depressed, the ninth spine Much depressed, the ninth spine 

 being only about a half shorter than being only about a fourth as long 

 the longest (3, 4, 5) and ci. fourth as the longest and a half as long as 

 shorter than the tenth. the tenth. 



