APRIL, 1910. FISHES OF CHICAGO MEEK AND HILDEBRAND. 233 



between the last gill opening and vent 70 to 73 ; dorsal fin divided by 

 a deep notch or a narrow space. 



Length 6 to 10 inches. 



This lamprey ranges from New York to the Great Lakes and Upper 

 Mississippi Valley. Its habits are quite similar to the preceding. It 

 spawns in April. The time after this species emerges from its larval 

 stage to its spawning time is so short that it is doubtful if it is ever 

 parasitic on fishes ; not recorded from the Chicago area. 



