Descriptions of New Illinois / y W<rx. 139 



beneath, with the opercles silvery. The sides of the tish are 

 also slightly silvery. Head small, 4.25 to 4.5 in length; nose 

 short and blunt, 4.5 to 4.75 in head; interorbital space 2.6 to 

 2.9: mouth very small, terminal, extremely oblique, almost 

 vertical, lower jaw included, its posterior extremity scarcely 

 reaching the eye, 3.2 to 3.4 in head; upper lip above the upper 

 margin of the pupil; maxillary scarcely attaining the nostril, 

 4.5 to 5.1 in head. Teeth 4-4, with grinding surf ace, sometimes 

 plain, sometimes crenate, more or less hooked at tip. Eye 

 large, 3.1 to 3.33 in head; iris dark above, silvery beneath. 

 Dorsal I 8, about one scale behind the ventrals, very oblique 

 on terminal margin, the posterior rays being less than half the 

 length of the anterior, height 4.5 to 4.66 in length; anal I 7, 

 height 6.33 in length, pectorals and ventrals moderate, the 

 latter attaining the vent, very nearly as long as the pectorals, 

 to 6.75 in length. Lateral line straight, complete, 34 to 37, 

 longitudinal rows 8 to 11, 13 or 14 before dorsal. 



Described from 24 specimens, all collected from Fox River 

 at McHenrv. 



