NUCLEI AND KINETIC ELEMENTS 



77 



some t}-pes of Protozoa, form the focal points of the mitotic spindle. 

 In man^' Protozoa minute granules may be embedded in a matrix 



Fig. M. — Chilodon sp. Macronucleus with endosome and cndobasal body (end) 

 {mo) Mouth surrounded by pharyngeal basket. (Original.) 



of chromatin or plastin, or in a combination of both. These in some 

 cases form the poles of t^^-pical spindles, but in the majority of cases, 

 apart from the polar granules and the connecting centrodesmose, 

 there is little evidence of a t^7)ical spindle. 



Fig. 3.5. — Endamoeba dysenterioe (Councilman and Lafleur). Two stages in the 

 metamorphosis of endosome and endoba.«al body. (After Hartmann.) 



In some cases this type of endosome undergoes changes in appear- 

 ance which Hartmann (1911) and his followers have interpreted as 



