SEX RECOGNITION IN CVCLOPS. 315 



might be expected to do if they were attracted by the odor of 

 the females. The experiment of removing the organ of smell 

 which was performed in the case of the amphipods would be 

 a fruitless one in Cyclops* as the seat of smell is located to a con- 

 siderable degree at least in all probability in the same organs that 

 are used for clasping. 



It is evident that mating in Cyclops is brought about much as 

 it is in the Amphipoda. The males have a strong tendency to 

 clasp other copepods ; the females tend to remain quiet in a 

 condition somewhat resembling the death feint while being seized 

 by the males. It is not improbable that olfactory stimuli may 

 cause the males to remain with the females longer than they 

 otherwise would, and they may render the males rather more 

 prone to seize females than other males, but so far as could be 

 determined by watching the behavior of the animals the specific 

 reaction of the two sexes to certain kinds of contact stimuli is 

 the main factor in bringing about their association. 



