Rate of Regeneration in Cassiopca xaviacliana. 



73 



mediisss operated on in this fashion regenerated similarly to this one. Their 

 manner of regeneration may then be briefly summarized as follows : 



The rate of proliferation of new tissue is faster from the deep partial- 

 cut surface and slower from the lateral surfaces. The angles of the deep 

 partial cut assist in the regeneration process and thereby help to make it 

 proceed faster from this portion of the cut, whereas the corners of the 

 lateral cuts seem to exert a retarding influence over the rate of regeneration 



Figs, io, ii, 12. Diagrams showing manner of cutting medusae disk to test regeneration 

 rates from partial cut surfaces. 



Figs. 13, 14. Stippled areas indicate course of regeneration from cut surface of pat- 

 tern, fig. 10. 



Figs. 15, 16. Course of regeneration from such a cut as shown in fig. 11. 



Fig. 17. Showing manner of regeneration from fig. 12. 



(see fig. 13). Such a conclusion is identical with that reached by Morgan 

 in his study of the regeneration from similar cut surfaces on the fish's fin. 



