66 



BIOLOGY OF THE PROTOZOA 



nucleus of Spirochona gemmipara (Hertwig). In this group, also, 

 we would include the peculiar hyaline globular bodies at the poles 

 of the nuclear spindles of Euglypha alveolata as described bv 

 Schewiakoff (1888). 



It is quite possible, although direct evidence is lacking, that none 

 of these peculiar pole plate structures belongs to the group of 



Fig. 34. — Bodo laccrtae Grassi; division stages continued. (E) Origin of centrioles 

 in the nucleus, and their retention in the daughter nuclei (F to G); (bb) basal bodies, 

 (c) centriole. (After Belar.) 



kinetic elements. Indirect evidence favoring this possibility is 

 furnished by the entire absence of observations on the division of a 

 definite body, the substance of which forms the pole plates. Hertwig 

 (1898) and Doflein (1916) assume that they are formed from the 

 "limn" substance of the nucleus. On this assumption the pole plates 

 might be interpreted as hyaline aggregates of the ground substance 

 of the nucleus, indeed, the hyaline and homogeneous appearance of 



