GENERAL CONSIDERATIONS 27 



An extreme case of reorganization in flagellates is apparent in the 

 two species of Lophomonas (L. blattae and L. striata) first described by 

 Janicki (1915). Here the parental calyx, basal bodies, blepharoplasts, 

 and rhizoplasts all degenerate and are resorbed during division (Fig. 7). 

 At the beginning of division, a cytoplasmic centriole divides with a con- 

 necting fibril, which is retained throughout as a paradesmose. The 

 nucleus emerges from the calyx in which it normally lies and moves 

 with the spindle to the posterior end of the cell. The spindle takes 

 a position at right angles to the long axis of the cell. Chromosomes, 



Figure 8. Chilodonella uncinatus. New pharyngeal basket and mouth, replacing old 

 ones. (After MacDougall, 1925.) 



probably eight in number, are formed and divided, and two daughter 

 nuclei result, each of which is enclosed in a new calyx, while new basal 

 bodies and new blepharoplasts apparently arise from the polar centrioles 



(Fig-/)- 



This phenomenon in Lophomonas is strikingly similar to the re- 

 organization processes occurring in one of the Chlamydodontidae — 

 Chilodonella. Here, according to the observations of Enriques (1908), 

 Nagler (1911), and MacDougall (1925), the old mouth of the cell 

 and the oral basket of trichites are discarded and disappear in the cell, 



