eigenmann: the cheirodontin^. 



75 



frontal fontanel an equilateral triangle, not more than one-third as long as the 

 parietal; third suborbital less than half as wide as eye, in contact with the pre- 

 opercle along the lower limb and the angle of the preopercle, a narrow naked area 

 behind it, and a narrow naked strip behind the postorbitals. Mouth small, the 

 maxillary half as long as eye. Teeth broad-tipped, seven-pointed, the median 

 point prominent, especially in the premaxillary. Four teeth in the premaxillary, 

 two in the maxillary, and seven or eight in the mandible. Gill-rakers 5 + 7, 

 about one-fourth as long as the eye. 



Origin of dorsal equidistant from tip of snout and base of caudal. Dorsal 

 pointed, its height about equal to the length of the head; adipose fin well-developed, 

 caudal lobes a little longer than head; origin of anal a little behind the vertical 



Fig. 26. Cheirodon notomclas Eigenmann. a, anal and interhsemals of a 9, 6813, C. M.; b, details of 

 the arrangement of the scales at the base of the caudal in a cf , 6S13a, C. M. 



from the last dorsal ray; tip of highest ray reaching to the base of the last fourth 

 of the base; pectorals reaching ventrals, ventrals not quite to anal. 



Scales regularly imbricate, a few scales in a single series along base of anterior 

 anal rays, ten scales between dorsal and ventral, caudal lobes naked. 



First dorsal rays and bases of the rest black; a sub-rhomboidal black spot 

 across the entire caudal peduncle, the spot bordered by unpigmented areas in front 

 and behind, the spot not extending to the end of the middle rays; anal dusky, the 

 first rays sometimes black. General color darker than usual in the genus. 



Base of the anterior half of the anal of the male as usual for this genus, much 

 more oblique than the base of the rest of the fin; fourth to ninth anal rays of the 

 male much thicker than the rest, with many retrorse hooks along the posterior edges 

 of the middle part of the'rays. 



