522 



C. M. Child. 



regards the amount and form of the new tissue; these are desig- 

 nated as A, B and C. 



A. (Figs. i6-iq.) One piece only regenerated in this manner. 

 It will be observed from the figures that in this case the contraction 

 of the cut surface was greater than in pieces containing ganglia 

 (see Figs. 2-5), and that the new tissue grew out from the wound 



as a rounded mass (Fig. 17), which later became somewhat pointed 

 (Fig. 18). Moreover, two groups of pigment spots, undoubtedly 

 eye-spots, appeared in the new tissue just anterior to the cut 

 surface. Regeneration never proceeded beyond the condition 

 represented in Fig. 18. No trace of regenerated cephalic ganglia 

 could be observed at any time. Fig. 19 represents the contracted 

 condition of the same stage; the form shown in Fig. 18 appeared 



