POLYTOMELLA CITRI, SP. NOV. 22Q 



in the same way as in P. citri with the exception that the centriole 

 remains inside the nuclear membrane. Although it is impossible 

 to definitely answer the third question suggested above, it seems 

 more probable that the granules degenerate because if they 

 entered the karyosome we would expect them to maintain their 

 integrity to sufficient extent to prevent the karyosome from 

 appearing perfectly homogeneous. Such is not the case. 



SUMMARY. 



The flagellate herein described belongs to the genus Polyto- 

 mella (Aragao, 1910). The specific name "citri" is proposed. 

 The size ranges from 10 by 7 micra to 14 by 10 micra. Outside 

 of the absence of chlorophyll the structure is typical for the 

 family Polyblepharididse. Although it is a colorless, saprophytic 

 organism the cell-body contains numerous starch bodies. 



The life history consists of active stage, in which reproduction 

 is by binary fission, and encystment. No reproduction takes 

 place during encystment. There is no indication of any sexual 

 process at any point of the life cycle. 



Conjugation is not well established in any species of the family. 



The chromosomes arise as a result of the fusion of chromatin 

 particles which have come from the karyosome. 



The cysts are filled with metachromatic granules. They 

 usually disappear before excystment. 



A new centriole and basal granules are given off from the 

 karyosome previous to excystment. Flagella do not grow out 

 until the cell comes in contact with the outside. Amoeboid 

 movement is the means of locomotion for several minutes 

 following excystment. 



