466 Trypanosoma Jeivisi 
{/) The periplast covers the protoplasm as a thin layer, which 
sometimes (especially in young cells) may be demonstrated as a delicate 
red line surrounding the cell. The periplast is more resistant than the 
rest of the trypanosome and is sometimes (with the flagellum and the 
blephai'oplast) the only thing that remains of the flagellate (Diagram VI, 
fig. 1). 
In such isolated periplasts longitudinal striae are sometimes to be 
seen, but whether they are myonemes or folds of the periplast I 
am not able to say, although the latter supposition seems the more 
probable. In normal cells I sometimes observed two longitudinal striae 
such as have been described by Prowazek (fig. 2) but this is all I saw of 
the complicated system of “myonemes” and “anchoring fibrillae” 
described by this author. Minchin doubts the existence of all these 
structures and I am inclined to share this doubt. 
2. Stages of division. 
(a) Division of the cell. (Diagram VII.) The normal mode of 
division, by formation of rosettes, has been described so carefully that it 
is not necessary to repeat this here (fig. 1). The products of this 
Fig. 1. Kosette. 
Fig. 2. Dividing “ leptomonas.” 
Fig. 3. Equal binary division. 
Fig. 4. Equal multiple division. 
Fig. 5. Unequal binary division. 
