90 



BIOLOGY OF THE PROTOZOA 



although originating from an endobasal body, are different in func- 

 tion from those described in the preceding paragraph. Forming the 

 poles of the mitotic spindle they are correctly described as centrioles, 

 but apparently they again become endobasal bodies (Fig. 38, p. 81). 

 While the flagella appear to emerge directly from the nucleus in 

 some cases, e. g., in Mastigamceha invertens according to Prowazek, 

 or Codosif/a hotrytis according to Doflein, in many cases they take 

 their origin actually from kinetic elements in the form of centrioles 



u 



Fig. 45. — Flagellum insertion. A, Phialonema cyclosfomum; B, Chilomastix 

 mcsnili; C, the same, encysted, (u.m.) Margin of undulating membrane in cytostome. 

 {A, Original; B, C after Kofoid and Swezy.) 



which lie on the outside of the nuclear membranes, as in Mastigina 

 setosa, Phialonema cyclosioma, Ccrcomonas longicauda, Oicomonas 

 termo, or Chilomastix gallinarum (Fig. 45). In such cases, illustrated 

 by Chilomastix aulostomi according to Belar (1921), centrioles, 

 become the basal bodies, and the latter become centrioles. In 

 such cases the basal bodies are unquestionably blepharoplasts. 



In other cases the blepharoplast does not remain connected with 

 the nucleus by any fibrillar process, but as an entirely separated 



