378 



DONNELL BROOKS YOUNG 



that such a system exists in Uronychia. If such an explana- 

 tion is correct, any cut severing the fibers connecting the moto- 

 riuni with the cirri should produce the same results. This is not 

 the case, for only when the cut was in the region where the 

 micronucleus is usually found, did monsters develop. 



TABLE 11 

 Experiments on starved cells of Uronychia setigera. Cells starved two days 



TABLE llA 



Uronychia setigera starved four days 



