94 Invertebrate Zoology. 



to pass above into the supra-cesophageal ganglion or brain. 

 Trace the nerves from the brain to the ocellus and to the 

 compound eyes. 



Make a drawing of the nervous system. 



The Reproductive System. The "brood-pouch" of 

 the female has already been noted. The ovaries are paired 

 organs, each lying parallel to the alimentary tract, and extend- 

 ing through a considerable portion of the thorax and abdomen. 

 They are beautifully brought out by the adoption of the xylol 

 method above described. Note, in the brood-sac, the large 

 eggs. Do you find any pore through which the eggs may 

 pass from the sac to the exterior? 



Make drawings of the female reproductive system. 



The external reproductive organs of the male are situated on 

 the anterior portion of the abdomen. Each consists of a 

 somewhat complicated apparatus, which is used in placing 

 the spermatophores in the sacs of the female. The testes 

 will be easily found as paired organs, of the same general 

 structure as the ovaries, though of not equal extent. 



Draw the reproductive system of the male. 



