Regeneration in Larval Legs of Silkworms. 597 



ate any part of itself, but the silkworm's body (trunk) cannot 

 regenerate a leg wholly lost. 



The structural characteristics of the normal thoracic legs and 

 normal prop-legs, are shown in Figs, i and 2, respectively, while 

 Figs. 3 to 8 illustrate cases of regeneration selected to show various 



Fig. 



Fig. 8. 



Fig. 7. Regenerated abdominal (prop-) leg of full-grown larva from stump of leg 

 cut off just above base after first moulting; at left profile view; at right, ventral view. 



Fig. 8. Regenerated abdominal (prop-) leg of full-grown larva from stump of leg 

 cut off just above base after first moulting; at left, profile view; at right, ventral view. 



degrees of it. Figs. 9 and 10 illustrate examples of no regenera- 

 tion. In no case of regenerated leg was there a complete re- 

 production of the original in all details, but in all cases the evident 

 tendency is plainly toward a replica of the original. In the case 

 of the segmented legs (the thoracic) the original number of 

 segments was usually reached and a small terminal claw was 

 produced although always in reduced condition. In the case of 

 the unsegmented prop-legs the terminal half circlet of hooks 

 characteristic of the normal leg was in no case of regeneration 

 completely reproduced, but in all cases a few at least of these 

 terminal booklets reappeared. 



