C. M. mil, I) A\l> I-;. V. M. M, KII-. 



one tilth <>I the distance from the cyc> to the tip of the head. 

 Five fiber tracts unsymmetrically situated an- indicated in the 

 section. 



In Fig. 21 the level of the eye is shown. The optic pigment 

 cup opens antero-ventrally and toward the left side and i- con- 

 nected by a nerve with the left side only of the ganglionic ma--. 

 The latter shows a distinct division into right and left halves. 



Near the posterior end of the regenerated region the nervous 

 system possesses the form shown in Fig. 22 and a short distance 

 posterior to this level and in the- old tissue the two nerve conl- 

 become separate except for an occasional commissure. 



In this case the eye, though median in portion, evidently 

 belongs to the left half of the ganglionic mass and the nervous 

 system is much less abnormal than in Case I. As in the other 

 cases, the eye is situated near the extreme anterior end of the 

 ganglion. 



4. In this case (Fig. 23) the fusion of the auricles at the front 



24- 



26 



FIGS. 2 ^ 



of the head is even more complete than in Case ,}, only the ba-e- 

 ot the sensory areas being separated. The eye is median and 

 apparently single and the pigment spot is of rather large si/e. 

 Anterior to the eye the ganglionic mass breaks up almost inline- 



