AN AMICRONUCLEATE OXYTRICHA 491 



of which contained a chromatin body. The cannibal now 

 measured 105 x 54 ju. 



No. 3. At the end of 3 hours and 40 minutes little change in 

 appearance of the bodies was noted. At the end of nine hours 

 only one body could be seen, and this had disappeared at the 

 end of 13 hours. The size of the animal now was 81 x 42 fx. 

 Study of the stained preparation showed a typical appearance of 

 cytoplasm and macronuclei. 



Cannibals containing four bodies. No. 4. In 1 hour and 47 

 minutes the animal had divided by fission with three bodies in 

 the anterior daughter cell,' 4a, and one in the posterior, 4p. 

 4a at the end of 3 hours (from beginning of experiment) showed 

 two bodies distinctly visible. The animal, measuring 93 x 54 n, 

 was then fixed and stained. A glance at figure 16 will show that 

 in the preparation the three food vacuoles are intact, one con- 

 taining the macronuclei of a swallowed animal, the remaining 

 two staining faintly and containing no chromatin. 4p con- 

 tained one body which was barely visible at the end of 2 hours. 

 In 3 hours this disappeared completely. The animal was fixed 

 and stained one-half hour later and gave the appearance as of a 

 normal animal except that its size (93 x 54 ^i) was slightly greater 

 than that of the average normal. 



No. 5. At the end of 1 hour and 40 minutes four bodies were 

 still distinctly visible. These became much less distinct in 2| 

 hours. In 3| hours two bodies only could be seen and these 

 were indistinct. At the end of 4| hours all bodies were appar- 

 ently digested. The animal was then stained and had the 

 typical structure of an ordinary vegetative animal, except for 

 tw^o large, faintly staining vacuoles in which no chromatin was 

 visible. 



No. 6. In 1^ hours this animal divided by fission, two bodies 

 passing to each daughter cell. 6a (90 x 57 /x) was stained at the 

 end of 2j hours. Here one body showed the nuclear structure 

 of the ingested animal; the other was smaller, stained faintly, 

 and showed no chromatin. 6p showed presence of both bodies 



^ 'a' denotes that the daughter cell came from the anterior part of the parent 

 and 'p' denotes the daughter cell from the posterior part. 



