1916] 



Swczii: Kinctoiniclriis of Flrigellatcs 



213 



and to extend to and around the nuclear membrane (McCuUocli, 1915, 

 pi. 2, 6g. 56). In some eases the rhizoplast extends directly to the 

 karyosome of the nucleus. The connection between the i-hizoplast and 

 the blepharoplast in these cases is not clear. Another method of at- 

 tachment of the rhizoplast is figured, however, which has important 

 bearings on the question of the function of the parabasal body. This 



16 



19 



Figs. 15-19. Crithidia leptocoridis McCuUoch, after MeCuUoch (1915, pi. 

 H, figs. 57, 58, 60; pi. 4, fig. 74), X 2880. Fig. 15. Trophozoite, showiug fibril 

 arising from the blepharoplast. Fig. 16. The same. Fig. 17. The same, 

 with a second fibril extending to the nuclear membrane. Fig. 18. Long, slen- 

 der trojjhozoite, showing same method of attachment of the rhizoplast. Fig. 

 19. Trophozoite, showing the so-called "axostyle'' arising from the blejiharo- 

 plast. 



method of attachment is shown in McCulloch's plate 3, figures 57, 58, 

 60, and plate 4, figure 70, reproduced in figures 15 to 19 of the present 

 paper. These show the rhizoplast arising from the blepharoplast and 

 passing around the parabasal body on its way to the nucleus. A slight 

 rotation of these figures would completely obscure its real origin, mak- 

 ing it appear to arise from the parabasal body as shown in other 

 figures. The relations of the entire neuromotor apparatus, consisting 



