N. H. SWELLENGREBEL 
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breadth. The nucleus is of the ordinary structure: peripheral chro¬ 
matin, and one or more central chromatic bodies (Diagram III, Fig. 1). 
The blepharoplast is very large (1'8/i long and 0’G-1'2 /a broad) as in 
other herpetomonads, but the peculiarity of the blepharoplast of this 
flagellate is, that it shows a rather complicated internal structure, 
which very much resembles a real nucleus. It is composed of a 
peripheral chromatic layer surrounding an achromatic substance, in 
which one or more chromatic granules may be seen. This large 
Diagram III. Herpetomonas calUphorae. 
1. Normal form. 2. Slender form. 
3. Blepharoplast become enlarged. Membrane between the two flagella. 
4-6. Division of the nucleus; in Fig. 6 an axial uncoloured filament is present; in 
Fig. 4, beginning of the divi.sion of the blepharoplast. 
blepharoplast might be regarded as an artefact due to Giemsa’s stain 
“ exaggerating ” the chromatin (according to Minchin), but this view is 
untenable, because preparations fixed and stained in accordance with 
recent methods (corrosive alcohol, iron-haematoxylin) show blepharo- 
plasts of the same size (Diagram VI, Figs. 1, 2). The protoplasm 
often contains chromatin-like granules, which do not become decolourised, 
when treated with 1 “/o sulphuric acid, and which are blackened with 
