General Morphology of the Protozoa 45 



centrifuge frequently separates chromophilic and chromophobic sub- 

 stances (190), sends the chromophilic elements to either the centrifugal 

 pole (191) or to the centripetal pole (3), sometimes stratifies the Golgi 

 bodies in different zones (237), and sometimes separates the "vacuome" 

 and the Golgi bodies (237). 



NUCLEI OF PROTOZOA 



Under the general term, nucleus, are included the micronucleus 

 and the macronucleus of ciliates and the vesicular nuclei of other Pro- 





5">< 



%. 



.4.2: • Vi 





Fig. 1. 20. Nuclei. A. Heteronema acus; x4290 (after Loefer). B. Mul- 

 tiple endosomes in H. acus; chromatin omitted; x3740 (after Loefer). C. 

 Haematococcus pluvialis; x3280 (after Elliott). D. lodamoeba biUschlii; 

 x4000 (after Wenrich). E. Chilomastix magna; x9360 (after Kirby and 

 Honigberg). F. Entamoeba histolytica; x3900 (after Wenrich). G. Zelleriella 

 elliptica; x2340 (after Chen). H. Pelomyxa carolinensis; x2070 (after 

 Kudo). Key: c, chromatin; e, endosome; g, peripheral "chromatin" gran- 

 ules; n, nucleolus. 



tozoa. On the basis of nuclear equipment, two types of Protozoa may thus 

 be recognized. In one group, the nuclei in binucleate and multinucleate 

 species are of the same kind, so far as structure can be determined and 



