Maxillary with a barbel, the barbel is small and often hidden in the 

 groove above the upper jaw. Care must be taken if the barbel 

 is to be observed, and it may be necessary to pull out the upper 

 jaw a little 4 



Maxillary without a barbel 7 



4. Barbel slender and at, or near, the end of the maxillary 



Lake Chub 

 Hyhopsis plumbea (Agassiz) 



Barbel often flaplike and obsolescent, and located on the lower 

 edge of the maxillary well in advance of the posterior end, 

 usually concealed in the groove between the maxillary and pre- 

 maxillary 5 



62 



