C. Strickland 227 
(iv) In this stage the transverse band of chromatin is divided into 
two equal parts. (Fig. 2g.) 
(v) The nucleus is seen to have divided into two spherical daughter 
nuclei, each with a peripheral ring of chromatin and a short transverse 
band of chromatin. (Fig. 2 h.) 
(vi) The further stages are represented by nuclei in which the 
chromatin network is reformed by fragmentation of the chromatin bands 
and the dissemination of the fragments to form a fine network in the 
nucleus. (Fig. 2 i, k, 1.) 
Fig. 2. Showing the structure of the dividing nucleus of Herpetomonas luciliae. 
(c) The blepharoplast lies midway between the nucleus and the 
anterior end of the cell, and is of very variable form (PI. IX, figs. 1-14). 
In the ‘ resting ’ cell it is apparently a homogeneous mass of chromatin ; 
but in dividing cells, the chromatin splits into two halves, which separate 
and reveal a lighter-staining intervening matrix. 
(d) The rhizoplast is in the same position as in the ‘ crop ’-forms, 
but it is thicker and contains more chromatin, and therefore stains 
very densely. In some forms the rhizoplast is split longitudinally, and 
in such cases it may be connected with either one or two chromatin 
filaments in the flagellum. 
(e) The flagellum, in ‘ resting ’ cells, consists of a chromatin 
filament surrounded by an extension of the cytoplasm, as in the ‘ crop ’- 
forms. In some cases, whether the rhizoplast be divided or not, the 
flagellum contains a second filament of chromatin which has no 
connection with the first filament. The two filaments, which may be 
very different in length, are connected together by a pink staining 
cytoplasmic membrane. In some of the forms containing two chromatin 
filaments the membrane stretched between the filaments is split either 
proximally, or distally, or both; and in other cells the division is 
complete, the cell then possessing two independent flagella. In such 
