124 C". M. Child. 



IV. September 3, 1902. Four large specimens were cut in the 

 manner represented in Figue 33. By this method the relation 

 between the plane of the cut surface and the direction of locomo- 

 tion is different in the right and left pieces. 



Two pieces of each set are described, the others showing no 

 additional features of importance. 



1. A piece from the left side (see Fig. 33) : Figure 34, seven 

 days after section; Figure 35, twenty days after section; Figure 

 36, thirty days after section. In this case the cut surfaces re- 

 mained nearly in their original relations and the piece was not 

 greatly bent. Consequently the curvature of the axis and of the 

 direction of locomotion was not as great in many cases. The 

 angle at which the body appears corresponds with the direction 

 of locomotion, but the axis of this region is far from perpendicular 

 to the posterior cut surface. In later stages this specimen became 

 symmetrical. 



2. A piece from the left side: Figure 37, seven days after sec- 

 tion; Figure 38, twenty days after section; Figure 39, thirty 

 days after section. This piece became so bent during contraction 

 that the posterior cut surface faced somewhat toward the right 

 instead of to the left as originally (compare Figs. 33 and 37) and 

 the direction of locomotion was correspondingly curved. The 

 longitudinal cut was a little to the left of the median plane, thus 

 injuring the left cephalic ganglion to some extent. The piece 

 was consequently less active In locomotion and the right margin 

 did not acquire full functional activity as soon as In many other 

 cases. There was therefore no marked change in the direction 

 of locomotion and the curvature of the axis persisted to a great 

 extent up to the time of death. In this case also It Is evident that 

 the outgrowth forming the posterior region Is not perpendicular 

 to the posterior cut surface. 



3. A piece from the right side of the head (see Figure 33) : 

 Figure 40, seven days after section; Figure 41, twenty days after 

 section; Figure 42, thirty days after section. In this case the 

 contraction of the piece, though not great, brought the two cut 

 surfaces almost Into line. The curvature of the regenerating 

 body is clearly shown in Figure 41. The outgrowth is more 



