SCIENTIFIC HISTORY OF THE BLACK BASS. 



21 



Scales of inferoperculum uniserial 



Covering only about half the 

 width of tlic bone. 



Covering the entire width of 

 the bone. 



None. 



Scales of preopercular limb 



Developed in an imperfect row 

 (e. g., 3-5 in number). 



Scales on dorsal 



Developed as a deep sheath (in- 

 volving last spine) of small scales 

 differentiated from those on the 

 back, and v/ith series advancing 

 high up the membrane behind 

 each ray (except last two or 

 three). 



Developed as a low (obsolete) 

 shallow sheath, and with series 

 ascending comparatively little 

 on membrane behind the rays 

 (none behind the last five or 

 six). 



Scales on anal 



Ascending high behind each 

 ray. 



None (or very few). 



Mouth 



Moderate. 



Large. 



Siijiramaxillary 

 Ending considerably in front of Extending considerably behind 



hinder margin of orbit (about 

 under hinder border of pupil). 



the posterior margin of orbit. 



Hays 



Dorsal, articulated, 13. 

 Anal III, ]0-ll. 

 Pectoral, MG-M7. 



Dorsal, articulated, 12 (I. 11). 

 Anal III, 10. 

 Pectoral, 1-14 (M3). 



Dorsal Jin in front of soft 2'>ortion 



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



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



than the longest (3, 4, 5) and a as the longest and half as long 



fourth shorter than the tenth. as the tenth. 



