PHYLOGENY AND ONTOGENY OF NEURONA 47 



FIG. 5. 



Sketch of the sensitive nervous system and motor of a worm. A, sensitive 

 cells of the skin ; B, direct motor cells ; C, crossed motor cells ; D, cells 

 of interganglionic association ; E, multipolar motor cells ; G, ramifica- 

 tions terminating in muscles of the motor neuronas. 



