100 



BIOLOCY OF THE I'ROTOZOA 



peculiar deeply-staining rod-like bodies fStaborgan) of Peranema 

 ■ trichophorn (Fig. 46, B), of Anisnneina, Kniosiphon, and related 

 genera, which behave like a parabasal in di\ision and belong to the 

 group of kinetic elements. 



From this review of the cytoplasmic kinetic elements in the flag- 

 ellates it is apparent that in endobasal bodies, basal bodies, and 

 parabasal bodies we have to do with structures closely connected 



tiWfiP 



Fig. 51. — Trichon.i/tnpha campanula in division. A, and B, prophase and anaphase 

 of nuclear division; the divided centroblepharoplast forms the poles of the spindle 

 and are connected by a paradesmose. C, and D, breaking up of chromosome spireme 

 into chromosomes which show a tendency to unite in pairs. (After Kofoid and 



Swezy.) 



with the kinetic acti^'ities f)f the organism and closely related to 

 each other. The chromatoid substance of which they are composed 

 may or may not be chromatin, although the evidence adduced indi- 

 cates that it arises from the nucleus and is similar to chromatin in 

 its staining reactions. It does not behave like chromatin during 

 division of tlie cell, but like pyrenoids, or chromatophores, where 

 each granule reproduces its like by division; nor does it afford any 



