NOMENCLATURE AND MORPHOLOGY. 131 



on the operculum about the size of those of the nape, (2) on 

 tlie subo])erculuui broiid and in one row, (3) on the interoper- 

 culum broad, conspicuous and reguhvrly imbricated, in one row, 

 (4) on the cheeks moderate (in about ten rows in an oblique 

 line, and five or six in a horizontal one), and (5) on the pre- 

 operculum (two to five) in an incomplete row. Mouth large, the 

 gape from the symphysis to the angle of supramaxillary equal- 

 ing nearly a half. of the head's length. Supramnxillnry not con- 

 tinued backwards decidedly beyond the vertical from the hinder 

 border of the orbit. 



" Dorsal fin with the anterior spines slowly graduated (the 

 first being comparatively long) to the third (1 = 1; II ^ 1.80 ; 

 111 = 1.50); fourth longest (but little more so than the third) 

 and equal to or exceeding the interval between the back and 

 lateral line; succeeding ones successively and in increased ratio 

 abbreviated to the ninth, which is very short (two-sevenths — 

 1:8.5 — of fourth), the tenth being longer than the eighth 

 (shorter than the seventh) and about two-thirds as long as the 

 longest (i. e., fourth). 



"Dorsal fin with scales ascending comparatively little behind 

 on the membrane behind the soft rays (none behind last five or 

 six). 



"Anal fin with no (or very few) scales. 



"Color, in young and adolescent, greenish-black, verging to 

 yellowish-white on lower sides and abdomen, with (1) a series 

 of large blotches arranged in a regular line, from shoulder to 

 caudal, on the middle of sides, the postei'ior third of which be- 

 comes a continuous stripe and (2) below this middle series, 

 rather irregular, small blotches, with tendency to become a con- 

 tinuous stripe on posterior third of body. Heiid dark above, 

 •white from lower half of maxillary bone, and suboperculum to 

 chin and throat, and with three oblique and horizontal bands 

 upon cheek, viz.: (1) one from angle of npp.er jaw to margin 

 of preoperculum, (2) one from lower edge of orbit to angle of 



