PLATE III. 



Cyclops quadricornis, Linn. — 1, mature female with egg sacks containing ova. 

 a, egg. &, young just bom. c, young eight days old. d, young fifteen 

 days old. c, young seventeen days old. o^, mandible, b^, first pair of 

 foot jaws. 2, side view of mature cy clops. 



