NUCLEAR REGENERATION IN STYLONYCHIA MYTILUS. 165 



mitotic division of the micronucleus. In every case studied, this 

 process took place before the animal divided. 



LITERATURE CITED. 

 Lewin, K. R. 



'n The Behavior of the Infusorian Micronucleus in Regeneration. Roy. Soc. 



Proc., Ser. B, Vol. 84, p. 332. 

 Young, D. B. 



'22 A Contribution to the Morphology and Physiology of the Genus Uronychia. 



Jour. Exp. Zool., Vol. 36, p. 353. 



