BLEPHAROPLAST AND PARABASAL 



53 



basal granules or blepharoplasts are developed from the nucleus or from its 

 karyosome (Fig. 31). In the case of Dimastigammha gruberi (Fig. 120), the 

 amoeboid phase of which develops fiagella under certain conditions, it was 

 stated by AlexeiefE {I9l2g) and Wilson (1916) that when this took place the 

 blepharoplasts of the two fiagella migrated into the cytoplasm from the 

 karyosome of the nucleus, with which they remained connected by a fibre. 

 As explained below (p. 263), the writer has been quite unable to observe 

 the origin of the blepharoplasts in this manner. It seems more probable 

 that the blepharoplasts are present in the cytoplasm, possibly on the outer 

 surface of the nuclear membrane, during the whole of the amoeboid phase 



Fig. 32. — Devescovina striata ( x ca. 1,900). 

 A. Ordinary flagellate showiiag coiled paraba"^al. 



(After Janicki, 1915.) 

 B. Dividing form. 



of tlie organism, and that they move to the surface of the body when 

 fiagella are commencing to form. In many Mastigophora, in association 

 with the blepharoplast, is another structure to which Janicki (1911) has 

 given the name parabasal ; it stains intensely with certain stains (Figs. 32, 

 33, 67). In some cases — as, for instance, in trypanosomes and their 

 allies — it seems to be in actual union with the blepharoplast, and to form 

 with it a composite body, the hinetoplast (Fig. 157). There is no conclusive 

 evidence that the parabasal body is of nuclear origin, as some have supposed. 

 It is a well-established fact, however, that division of the organism is 

 preceded not only by division of the nucleus, but also by division of the 

 blepharoplast and parabasal as well, and it becomes a tempting hypothesis 



