78 



H. W. Rand and E. A. Boyden, 



axis of the worm and the lateral strip being removed from the longer 

 lateral edge of the decapitated worm. The broken lines in Fig. H 

 indicate the positions of the two cuts. The results in this series of 

 cases were as follows. The worm became bent somewhat like the 

 letter S, much as when the removal of the lateral strip followed 

 decapitation by an interval of several days (Fig, F), and the posterior 

 bend of the axis, caused by the lateral cut, was much more pro- 

 minent than the reverse anterior bend caused by the oblique de- 

 capitation. In two of the five cases the regenerating eyes were 

 unequal and the larger eye was outside, that is, on the side opposite 

 that from which the lateral strip had been removed. In one case 

 the inside eye was the larger and in the remaining two cases the 

 regenerating eyes were so abnormal in form and position that they 



Fig. H. 



Fig. J. 



Fig. K. 



could not be taken into account. In this series, then, two of the 

 three significant cases regenerated unequal eyes whose relative sizes 

 were the reverse of what was to be expected if oblique decapitation 

 had not been accompanied by removal of a strip from the longer 

 Jateral edge. 



V. In another series of five individuals decapitation was effected 

 by a transverse cut and immediately a long strip was cut away from 

 one edge (see Fig. J). The axis of the regenerating worm was 

 sharply concaved toward the side from which the strip was removed. 

 In two of the five worms the larger regenerated eye was outside, 

 in one case the larger eye was inside, in each of the other two 

 cases the eyes were equal. « 



