A Free-Living- Copepod. 97 



which bring about the movement of the second antennae, 

 and other less important locomotor appendages. There 

 are also two large muscular bands that forcibly flex the 

 body. 



The Nervous System is too difficult of demonstration 

 to be here considered. The olfactory hairs of the first 

 antennae have been noted. The ocellus is the visual organ. 



The Reproductive System. In the female the ovary 

 is found to occupy a median dorsal position, extending as a 

 somewhat elongated organ about two-thirds the length of 

 the cephalothorax. Leading from the ovary to the external 

 ovisacs are the oviducts. Each oviduct is a coiled structure, 

 lying laterally to the ovary and often containing ova. Its 

 external opening is through the first abdominal segment. 

 The ova are fertilized from a receptaculum sewinis, as they 

 pass into the large ovisacs. How many eggs does each 

 ovisac contain ? The young hatch in the interesting " Nau- 

 plius stage." 



The sexual organs of the male consist of a median testis 

 and two coiled, laterally extending vasa deferentia. Each 

 vas deferens finally opens into a terminal receptacle, where 

 the spermatozoa are collected, and form a spermatophore. 

 At time of coitus the spermatophore leaves the body of the 

 male, through an opening in the first abdominal segment, 

 and passes into the receptaculum seminis. 



Make drawings of the dorsal and lateral views of the male 

 and female. 



