182 
C. H. MARTIN. 
flagellum in contact with the body-wall, although there is no 
evidence of a membrane. Along the line of attachment of 
the posterior flagellum to the body a number of bright 
granules can be seen according in appearance with those 
found in Trypanoplasma. At the posterior end of the body 
a number of large food-vacuoles are to be seen. The animal 
very often becomes fixed by the posterior end, and well- 
marked euglenoid movements are shown, both during pro- 
gression and when stationary. A mouth can be readily made 
out in life near the base of the anterior flagellum. 
In stained preparations the body of Heteromita dahlii 
is a spindle-shaped structure, slightly elongated at the 
anterior end, at which a small cytostome can be seen. The 
two flagella take their origin near the anterior end from two 
small blepharoplast granules lying anterior to the kineto- 
nucleus. The anterior flagellum is much thickened at its 
base. The posterior flagellum runs back closely attached to 
the body of the animal, to end freely, and there is no trace 
of an undulating membrane. Near the anterior end there is an 
elongated, darkly staining kinetonucleus ; this, as Keysselitz 
has already pointed out, is very variable in shape, but most 
frequently it seems to consist of a small, rounded anterior 
portion connected by a narrow neck with a rod-shaped mass 
(PI. 9, fig. 8), but forms are met with in which the kinetonucleus 
presents quite a different appearance (PI. 9, fig. 7), and in some 
cases the process of division of the kinetonucleus is carried 
still further. The trophonucleus is small and spherical. It 
contains a large karyosome, but most of the chromatin seems 
to appear in the form of granules lying between the karyosome 
and the nuclear membrane. In the earliest stage of division 
which I have found the body of the animal becomes very 
rounded (PL 9, fig. 8), the flagella have already split along 
their whole length, and the karyosome within the membrane 
of the trophonucleus has become elongated. The kineto- 
nucleus is thickened, and shows a slight split at its anterior 
end. In the next stage one blepharoplast with its attached 
flagella has travelled back along the animaTs body, together 
