NUCLEI AND KINETIC ELEMENTS 



91 



and independent kinetic element gives rise to the flagella at or near 

 the anterior end of the cell {Leptomonas jaculum, Scytomonas suh- 

 tilis, Dobell (1908), Scytonionas piisiUa, Schiissler (1918), or Her- 

 petomonas gerridis (Fig. 96). In Chilomastix mesnili Kofoid and 

 Swezy (1920) describe three blepharoplasts, one of which gives rise 

 to two flagella, another gives rise to one flagellum and the parastyle, 

 the third to the parabasal, peristomial fibril, and the cytostomal 



^ 



B 



Fig. 46.—^, Chilomonas Paramecium; B, Peranema trichophora, (1) flagella; (2) 

 two fused blepharoplasts; (3) blepharoplast divided prior to division of the cell; (4) 

 parabasal body; (5) nucleus. (After Calkins.) 



flagellum (Fig. 45, B). Boeck (1921) has confirmed these findings. 

 Or, the blepharoplast may migrate toward the posterior end of 

 the cell where with or without division to form blepharoplast and 

 basal body, it gives rise to a flagellum, which becomes the vibratile 

 margin of an undulating membrane as in the majority of trypano- 

 somes (Fig. 48, E). In still other cases the blepharoplast also gives 

 rise to one endoplasmic fibril or rhizoplast, which extends deeply 



