108 



LIBBIE H. HYMAN 



and a graph of the same in figure 4. The relative time of disinte- 

 gration of the second zooid as compared with the first depends 



WS 



•:>^^'';; 





Fig. 3 Three stages in the disintegration of an Aeolosoma in which physiologi- 

 cal isolation of a zooid is well advanced. 



Fig. 4 Graph of the axial gradient of an individual similar to figure 3. 



on the degree of development of the former; at the beginning 

 of its existence, when it is present physiologically only, its time 



