REPRODUCTION 



131 



conspicuous and the two daughter nuclei are completely recon- 

 structed to assume the resting phase (j-l). The mitosis of another 

 heliozoan Acanthocystis aculeata is, according to Schaudinn and 

 Stern, very similar to the above. Aside from these two species, the 

 centriole has been reported in many others, such as Hartmanella 



Fig. 58. Nuclear and cytosomic division in Oxnerella maritima, X about 

 1000 (Dobell). a, a living individual; b, stained specimen; c-g, prophase; 

 h, metaphase; i, anaphase; j, k, telophase; 1, division completed. 



(Arndt), Euglypha, Monocystis (Belaf), Aggregata (Dobell; Belaf; 

 Naville), various Hypermastigina (Kofoid; Duboscq, Grasse; Kirby; 

 Cleveland and his associates). 



In numerous species the division of the centriole (or blepharo- 

 plast) and a connecting strand between them, which has been called 

 desmose (centrodesmose or paradesmose), have been observed. Ac- 



