EEroiiT on ichthyology. 4lM 



The color, in spirits, is olivaceous on the head and body above and laterally, and 

 below and on the abdomen whitish. The membrane between the rays of all the fins 



is blackish, while the ravs themselves are light. The bases of the anal and caudal fins 

 are reddish. The teeth are of a dark-purplish color. 



Two specimens of this species were obtained on Captain Simpson's expedition by 

 Mr. McCarthy. The precise locality is not known ; but it is supposed that they were 

 obtained in Nebraska. 



Body mode 

 compressed. 



Head large 

 with a slight lor 

 The skin is ver] 



S5S 



Mouth ante 



mil or moderate 

 >rior, large, and 

 date, and closelj 



.atedina broad band in each jaw, wine 

 the lower one, is interrupted by a linear interval, and in the upper one is contim 

 the band of the upper jaw is either abruptly truncated at each end, or prolo 

 backward by a continuation from the postero-extemal angle. The lower band i 

 usual, attenuated toward the corners of the mouth. 



Branchiostegal membrane with nine rays on each side. 



Dorsal fin situated over the posterior half of the interval between the per 

 and ventral fins, with a verv pungent, short, edentulous spine, and seven branched 



Adipose fin Ion- and low, connected with the accessory rays of the cauda 

 and not forming a separate tin. 



r<o„.l„l fl„ vnv^l.li.n.lv triin.-ntP or rounded, and ii.s.-rted on an equally obli( 



01 " The anal fin is comparatively short, and rapidly increases in height for the 

 half of its length. 



The ventrals are rounded, and each has one simple and eight branched rays 



