FOREST, LAKE, AND RIVER 



may be differentiated, will find scales on the cheeks 

 and gill-covers of the pickerel; cheeks on the 

 pike are scaly, but the lower half of the posterior 



Head of Pickerel 

 On which the scales cover completely the cheeks and gill-covers. 



Head of Pike 

 The cheeks are scaly and the lower half of posterior gill-covers 



are not so. 



gill-covers are naked, without scales ; while the 



lower half of both the cheeks and gill-covers are 



free from scales in the mascalonge. The draw- 



6 



