CER 



GHR 



INF 



CER 



VII+VIII 



Fig. 20. — Brain of 

 Ammoccetes. 



A, dorsal view; B, late- 

 ral view; C, ventral 

 view. 



Vll+Vlil 



(B) xVff 



C.E.H., cerebral hemi- 

 spheres ; G.H.R., 

 right ganglion habe- 

 nulse ; PN., right 

 pineal eye ; CH„, 

 CH 2 , choroid plex- 

 uses ; I.— XII. cra- 

 nial nerves ; C.P., 

 Conus post-commis- 

 suralis. 



