LOCALIZATION OF NEW AXES IN CORYMORPII A. 



471 



as a new polar axis. The radial symmetry accompanying this new 

 polarity seemed to be primarily merely an expression of the like- 

 ness of all radii in a plane vertical to the polar axis. 



In the hope that it might be possible to determine a new polarity 

 from the lateral stem region of Corymorpha in a manner some- 

 what similar to that employed in Harenactis the stems were cut 

 as follows : with small, fine-pointed scissors cuts one to two mm. 

 in length, radiating from a center, were made as indicated in Fig. 

 i, the purpose of the operation being merely to localize a region 



3 



4 



FIGS. 1-4. Development of hydranth from lateral region of growth de- 

 termined by radiating cuts as shown in Fig. i. 



of active cells. In all cases the original hydranth was removed in 

 order that its dominance might not interfere with the development 

 of a lateral hydranth and in some of the earlier series the new 

 hydranths which developed at one or both ends of the piece were 

 also removed in early stages for the same reason, but this was 

 found to be unnecessary. Closure of this wound was slower than 

 in case of a simple cut, but was usually complete in twelve to 

 twenty-four hours. In the successful operations the region began 

 to bulge soon after closure (Fig. 2) and soon became a definite 

 rounded outgrowth which underwent elongation (Fig. 3) and 

 after two or three days attained the form of a hydranth with 

 early stages of tentacles (Fig. 4). 



Figures 5-18 show characteristic results of this operation. In 

 all figures the region of stem covered with perisarc is indicated 

 by heavier outline than other regions and the perisarcal accumula- 



