
of the same genus. Length: 13-16 u excep- 
tionally 11; Width: 9-11 y exceptionally 7. It 
is the largest Chilomastix living in Mammals. 
Anterior extremity obtuse, round; poste- 
rior end sharpened or rounded, but always 
narrower than the anterior one. At the fore 
end, a cytostome with chromophilous lip, 
from 4—5 wu long; from 2—3 broad. In stain- 
ed specimens it is often apparently wound > 
round the nucleus. An undulating membrane 
runs backwards across the cytostome; it 
starts from a blepharoplast, placed in front 
andto one sideof the nucleus; it also gives 
rise to the lip. Three slender anterior flagel- 
la of more or less the same length as the 
body start from this blepharoplast or from 
another beside it. 
Protoplasm divided in ecto and endo- 
plasm. Periplastic layer continous, finely gra- 
nular and so rigid as to prevent metamorphic 
movements, Endoplasm alveolar. On the 
walls limiting the alveolae fine granules are 
seen. It seems that when unstained, this 
species looks more granular than Ch. ¿ntes- 
tinalis. 
Nucleus anterior, sometimes lateral 3—4 
u in diameter. One or two somewhat lenticu- 
laf chromatin masses adhering to the thick 
nuclear membrane. When there are two, one 
is larger than the other. Clear zone almost 
empty. A large central caryosome is seldom 
seen; when it is found there are generally 
no large chromatin masses. 
Habitat: Coecum of Mus (Epimys) nor- 
wegicus. | 
This species is dedicated to Dr. NAS- 
CIMENTO BITTENCOURT, professor of 
Medical History, who was the first to teach 
Parasitology, in the Faculty of Medicine of 
Rio de Janeiro. 
Chilomastix caprae FONSECA, 1915. 
Description: Body elongate, more or less 
pear-shaped, the two posterior thirds nar- 
rowed, sometimes suddenly. Not metamor- 
phic, seldom: changing in outline. Length 
9-12 w, Width: 5-6 u. 
Anterior extremity round, with a lateral 
54 




hollow, almost parallel with the side margin 
of the body. Posterior end sharped to a ge- 
nerally short tail. Seldom rounded. 
Protoplasm divided in ecto and endo- 
plasm. Periplast rigid, making metamorphic 
movements impossible. Endoplasm alveolar 
with a few inclusions; in the two anterior 
thirds the vesicles are large and coarse, in 
the posterior one small and delicate. 
At the anterior end there is a cytosto- 
me, which is easily seen in unstained speci- 
mens, the chromophilus lip shows well after 
staining; generally only slightly bent, 3—4 
u long, 1-2 wide; the cytostome is crossed 
by an undulating membrane with a not chro- 
mophilous rim formed by an adherrent fla- 
gellum, coming from the blepharoplast. This 
is anterior to the nucleus, sub-marginal and 
the starting point of the cytostomic lip. 
The nucleus is anterior, sub-marginal, 
spheric and poor in chromatin; sometimes 
it is apparently below the cytostome at others 
above it. It is often lateral; caryosome of- 
ten seen connected with the blepharoplast by 
a rhizoplast; nuclear chromatin in bent rods 
adhering to the nuclear membrane; there 
are mostly more than two and they are often 
joined to the caryosome by linin strands 
radiating from the center to the periphery of 
the nucleus. Three anterior flagella of equal 
length starting from the blepharoplast. 
Habitat: Rumen of Capra hircus. 
Note: Braune describes two flagellates 
found in the stomach ofruminants but gives 
a wrong classification of them. One of them isa 
Trichomastix, which | have not had the oppor- 
tunity to study, and which the author consi- 
ders as a Trichomonas. The other has three 
anterior flagella only, and no undulating 
membrane and cytostome. lt can not be Ch. 
caprae, from which it differs considerably. 
Braune takes it for a Trichomastix. 
Chilomastix cuniculi FONSECA, 
1915. : 
Description: Body pear-shaped, elongaté 
and narrow, seldom broad, rounded and 
short. Length: 7—9 u Width: 4—7. 
