74 



BIOLOGY OF THE PROTOZOA 



micronuclei {Paramecium caudaium, P. bursaria, etc.), which in 

 some cases assumes the form of a centriole, forming a typical cen- 

 trodesmus during division {e. g., in first maturation spindles of 

 Uroleptus mohilis). 



Fig. 33. — Bodo ovatus Stein (edax, Belar). (1) Vegetative individual with two 

 flagella; blepharoplast (6^ and nucleus with endosome. (2 to G) Division of the 

 basal bodies, blepharoplast and nucleus; (7 to 10) completion of nuclear division and 

 division of cell body. (After Belar, from Dofiein.) 



3. KINETIC ELEMENTS. 



The kinetic elements of Protozoa are those structures of the cell 

 which are closely connected with the visilile expression of the trans- 

 formation of energy resulting from destructive n^ietabolism. Such 

 expression may be in the form of movement due to the activity of 

 specific motile organs formed as a rule from the substance of kinetic 

 elements, or it may be in the form of intracellular activities as indi- 

 cated l)y the transformation and movements of internal attraction 

 centers, center of radiation, of nuclear division, etc. The kinetic 

 elements are justly regarded by many observers as the most elusive 

 and perplexing, but at the same time the most fascinating of all 

 the organoids of Protozoa. 



