44 



C. M. CHILD AND E. V. M. MCK.IK. 



masses lie some distance apart and are connected by "commissures. 

 The pigment cups of the eyes open laterally and the optic nerves 

 pass in a dorso-ventral direction. Between the eyes the median 

 anterior branch of the alimentary tract appears. 



3 



S 



FIGS. 1-5. 



Herr 



Figure 5 is from a section at ihe level <>l tin- aurick>. 

 there is no distinct commissure between the ganglionic 

 It is quite possible, however, that they arc not mtiivly discon- 



