598 



Vernon L. Kellogg. 



To sum up the results of the experiments, we may say, {a) that 

 the larva of the silkworm moth, Bomhyx mori, has the capacity 

 of regenerating its thoracic and abdominal (prop-) legs from 

 stumps of these legs, but not from the body (trunk), /. e.-> that 

 each leg has the capacity to regenerate any distal part from 



Fig. 9. 



Fig. 10. 



Fig. 9. Ventral aspect of third thoracic segment of full-grown larva, which had the 

 left leg cut off at base after the second moulting; no regeneration. 



Fig. 10. Ventral aspect of abdominal segment of full-grown arva, which had the 

 left leg cut off at base after the first moulting; no regeneration. 



any proximal part, but that the body cannot produce a wholly 

 new leg; (^b) that this regeneration shows externally not after 

 the first moulting after the mutilation but after the second moult- 

 ing, and that the regenerative processes are completed with the 

 appearance of the new parts after this second moulting succeed- 

 ing the mutilation. 



Regeneration of Caudal Horn. 



The small caudal horn, a pointed non-segmented, but movable, 

 process projecting upward from the dorsal surface of the penulti- 

 mate abdominal segment was cut off in many larvae (silkworms) 

 of various ages, and in no case was there the slightest regeneration. 

 After the first moulting succeeding the mutilation the new skin 

 always extended smoothly over the place where the horn had been, 

 without any sign of scar. 



The function of this horn, which occurs on some other lepi- 

 dopterous larvae, notable and characteristically on the larvae 

 of the Sphingid moths, is unknown. It has been explained by 

 some entomologists as an ornament, by others as a "terrifying 



