jordan-snyder] collection of fishes from japan 231 



distinctly visible, the others partly covered by the gums. Upper 

 surface of tongue and roof of mouth with minute prickles. Spiracle 

 on a level with eye, its greatest width equal to its distance behind 

 eye, one-half the width of the first gill opening. Length of gill 

 area equal to distance between eye and first gill opening ; second, 

 third, and fourth gill openings about equal in width, the fifth 

 narrowest. Skin closely covered with minute, trilobed scales, each 

 of which has a central keel. Upper edge of tail with a keel be- 

 ginning an eye's diameter behind base of second dorsal and extend- 

 ing posteriorly a distance somewhat greater than length of head ; 

 keel armed by two rows of enlarged, tooth-like scales, the inner 

 edge of each scale having a sharp cusp ; about three rows of scales 

 similar to those of the body between the rows of larger ones. 



First dorsal fin inserted above posterior edge of base of ventral, 

 its distance behind tip of snout equal to 25^ times the length of 

 head ; length of anterior edge of fin equal to length of snout. 

 Second dorsal inserted anterior to end of base of anal. Free edges - 

 of both dorsals straight. Caudal fin with a notch on the ventral 

 edge near end of fin. PVee edge of pectoral slightly convex ; when 

 depressed the fin reaches a little over half way between origin of 

 pectoral and ventral. Ventrals sharply pointed posteriorly. Tip 

 of anal reaching" a vertical through posterior end of base of second 

 dorsal. 



Color in spirits brownish above with indistinct clouds of a deeper 

 shade, the more conspicuous of which are located as follows : above 

 and a little behind base of pectoral, midway between pectoral and 

 ventral, below bases of dorsals, on upper edge of tail and on caudal 

 fins. Dorsals dusky, their anterior edges dark brown. Anterior 

 edges of caudal, anal, and pectorals dark brown. Free margins of 

 dorsals and of anal white. Pectorals dusky above, the free margins 

 white. Tongue and inside of mouth without dusky color. 



The following measurements are in hundredths of the total length 

 (snout to tip of caudal fin) : Head measured to first gill opening 

 .15; depth .085; depth of caudal peduncle .04; width of first gill 

 slit .017; longitudinal diameter of eye .04; length of snout .07; an- 

 terior edge of mouth to tip of snout .065 ; distance between nostrils 

 .02 ; width of mouth ,075 ; length of anterior edge of first dorsal 

 .07 ; of second dorsal .07 ; length of base of first dorsal .045 ; of 

 second dorsal .05 ; distance from insertion of ventral lobe of caudal 

 to notch .20 ; from notch to end of caudal .06 ; width of base of 

 pectoral .05 ; length of anterior edge .09 ; length of base of ven- 

 tral .07. 



