AN AMICRONUCLEATE OXYTRICHA 493 



end of 9 hours, fission took place. 10a, with two bodies still 

 visible in the living animal, showed upon staining that these 

 were in an advanced stage of digestion. lOp. Examination 

 of the living animal showed apparently normal structure. This 

 was verified later by a study of the stained preparation. Size, 

 90 X 45 M. 



Cannibals with six bodies. No. 11. Fission occurred in 1 

 hour and 25 minutes. In each daughter cell two bodies only 

 could be seen. In 12a, at the end of 2 hours and 10 minutes, 

 the bodies were much less distinctly seen. The stained prepa- 

 ration showed that the bodies were nearly digested. Size, 

 102 X 45 /i. 12p was stained at the end of 3 hours. Here diges- 

 tion had not proceeded so far and the nuclear structure of the 

 swallowed animals could be distinctly seen. 



Cannibals with seven bodies. No. 12. Little change could be 

 seen at the end of 2 hours and 12 minutes. Fission then began 

 and was completed in 25 minutes. 14a received four bodies 

 and 14p, three. In 12 hours 14a had completely digested the 

 four bodies and was in a prefission stage. 14p. At the end of 9 

 hours only two bodies could be seen. In 12 hours one body was 

 barely visible. Fission occurred at the end of 13 hours. Half 

 an hour after fission 14pa was stained. Examination of the speci- 

 men showed that complete digestion of the ingested animals had 

 taken place (fig. 18). 14pp, stained at the same time, showed 

 a similar result. 



Caymibals with eight bodies. No. 13 was observed to be in 

 fission 15 minutes after isolation and was stained and mounted. 

 Study of figures 19 and 20 (showing two views of the specimen) 

 reveals the presence of eight bodies, two of which are in an ad- 

 vanced stage of digestion. The anterior daughter cell contains 

 five of these, the remaining three are in the posterior daughter 

 cell. The widths of these daughter cells, 54 and 66 fi, respec- 

 tively, are considerably greater than that of the average normal 

 animal, although the length of the specimen, 165 /x, does not 

 indicate that the cells which w^ould have resulted, if fission 

 had been completed would have been longer than an average 

 non-cannibal animal. 



