450 



The Ohio Naturalist. 



[Vol. XV, No. 4, 



The time consumed was 20 seconds. Then the reverse flow- 

 occurred and the protoplasm containing the granule of the indi- 

 vidual on the right would flow to the left as indicated by the 

 dotted arrow. It would seem at times as if an observer could 

 scarcely refrain from concern as to the probability that one indi- 

 vidual would inherit all the paramylon. At 4:25 P. M. (Fig.l, F) 



OoO" 



c 



D 



E 



F 



H 



Fig. 1. (x .500). Cell division in Ruglena oxyuris Schmarda and For- 

 mation of Paramylon. p = pharynx. s = stigma. p' = anterior paramj'lon 

 granule. n = nucleus. p2 = posterior paramylon granule. c = chloroleucites. 



the process of division was completed, the nuclei having moved 

 posteriorly and the individuals appearing normal in every way 

 with the exception that each lacked the large anterior paramylon 

 granule. Observations were made periodically the folio ing 

 day with the expectation of noting the development of the new 



