THE HffiMOFLAGELLATES. 



191 



ally fade away and are eventually dissolved up in the cyto- 

 plasm. Concurrently, the large female nucleus has behaved 

 in a manner recalling the division of the original compound 

 nucleus of an indifferent ookinete, giving rise, by a hetero- 

 polar division, to a tropho- and a kineto-nucleus (c). The 

 latter proceeds to form a complete but somewhat feebly- 

 developed locomotor apparatus (d). 



A female Trypanosome differs from an indifferent one by 

 its plumper shape and its denser, more deeply-staining cyto- 



FiG. 10. — Development of a female Trypanosome from an 

 ookinete of female character, m.n. = degenerating male nuclei ; 

 a.s^y. = first axial spindle of female nucleus ; f.t. = female tropho- 

 nucleus ; f.l: = female kinetonucleus. (After Schaudinn.) 



plasm, containing granular reserve nutriment. The kineto- 

 nucleus is smaller and the flagellum shorter; hence the 

 movements of the parasites are feebler and slower, and they 

 soon pass, for a time, into the attached, resting-phase, 

 characterised, as before, by the retrogression of the locomotor 

 apparatus. These forms appear to have quite lost the capacity 

 of longitudinal division, either in the trypaniform or gre- 

 gariniform phase. Growth is accompanied by a considerable 



