338 



ZOOLOGY. 



sented by the circle behind the brain, sp ; Fig. 283, op), 

 which go to the compound eyes, and from the front arise 



. 



*g rj n; O/.* t 



S X a) 



.- e-- 



the three slender filaments which are sent to the three ocelli 

 (Fig. 281, oc). From immediately in front, low down, arise 



