[MAVOR] PROTOZOAN PARASITES 65 
plasm has an elongated body from which arise two flagella, one 
directed anteriorly (Fig. 1, A, a. f.), the other posteriorly. The 
posterior flagellum (p.f.) forms the margin of an undulating membrane 

Fig. 1. Trypanoplasma, borreli, Laveran et Mesnil, from the blood of the sucker, 
Catostomus commessonii. A, Form with a single kinetonucleus. B, form with two 
kinetonuclei. a.f., anterior, p.f., posterior flagellum; u.m., undulating membrane 
bounded by posterior flagellum; tr., trophonucleus; kn., kinetonucleus. Drawn with 
the camera lucida from dry smears fixed with osmic acid vapour and stained with 
Giemsa’s azur-eosin. x 2700. 
(u.m.) extending the length of the body and is continued posteriorly 
as a free flagellum for a length about equal to two-thirds of the length 
of the body. The measurements of the body are, length 20—25n, 
thickness 3-4u. The lengths of the flagella are, anterior 14~-16y, 
posterior (including only the free portion) 14-16u. The parasites 
performed rapid writhings of the body accompanied by lashing of 
the flagella and undulations of the membrane but showed little 
progression. 
The endoplasm contains numerous granules measuring up to -4/ 
in diameter and staining deeply with Giemsa’s azur-eosin (Fig. 1,A). 
The kinetonucleus (Fig. 1, A, kn.) is situated about one-third of the 
length of the body from the anterior end, where the two flagella arise, 
and is on the side opposite to that to which the undulating membrane 
is joined. The trophonucleus (Fig. 1, A,tr.) is situated slightly 
behind the kinetonucleus and on the same side as the undulating 
membrane. The kinetonucleus stains purple while the trophonucleus 
stains red, with Giemsa’s azur-eosin. Both nuclei are surrounded 
