see ag 
towards the dorsal surface; this curve is 
stronger in the males, insome specimens of 
which the head is almost at a right angle to 
the body. Lateral expansions comparatively 
short, dwindling down at the posterior ex- 
tremity of the oesophagus, delicately trans- 
versally striated; 1,272 mm. long. Excretory 
pore Opening on the ventral surface a little 
beyond the nerve collar. Mouth ellipsoid, 
with indistinct lips, and six papillae, three 
on each side, the middle one larger than 
the two lateral ones. Buccal capsule small, 
conical, narrowing rather in the middle part, 
0,055 mm. deep, 0,026 mm. wide in the 
widest part, and 0,035 mm. at the extremiti- 
tes. Three small, equal, clubbed teeth at the 
extremity of buccal cavity, at the entrance to 
oesophagus, 0,034 mm. long. Oesophagus 
rectilinear, with pear-shaped posterior extre- 
mity, 1,24 to 1,60 mm. long, the walls mus- 
cular in the initial part, diminish gradually, 
thickening again after the middle part to- 
wards the posterior limit, being the thickest 
at the height of the terminal dilatation. The 
lumen of the oesophagus reveals chitinous 
layers, which thicken until the juxta-bulbular 
extremity. Bulb almost spherical, united to 
the oesophagus by a small canal of muscu- 
lar walls, containing a thin layer of chitin; 
diameter of bulb, 0,25 mm.; bulbous appara- 
tus formed by three sub-triangular plates 
with chitinous borders. Intestine dilated in 
the initial part, rectilinear at the terminal 
segment, with a thin-walled rectum. 
Male: Excretory pore 0,558 mm. from 
cephalic extreinity. Caudal part strongly cur- 
ved towards the ventral surface, ending in an 
aculeiform appendix, 0,279 mm. long. Sucker 
ellipsoid, with chitinous border from front 
to back 0,213 mm.; its lower border 0,798 mm, 
from tail end. Almost no caudal expansions. 
Genital papillae eleven in number, arranged 
thus: three pre-anal ventral, one, the largest 
of all, at the level of the middle third of the 
sucker, One large one midway between the 
posterior limit of sucker and anus, one like 
the latter one in size near the anus; two ad- 
anal large: one sub-ventral, one on the late- 
ral surface of body: six post-anal: two larger 
ones ventral, equidistant near the ano-genital 
orifice, two smaller ventral ones : one near 
the caudal extremity where the aculeiform 
appendix is inserted; one large, lateral one at 
the level of the second papilla counting from 
posterior extremity; finally one very small la- 
teral one between the two last ventral papil- 
lae. Two unequal spicules distal extremity 
sharp-pointed; the larger one is thinner 
1,270 mm. long. the lesser one sinous more 
strongly chitinised is 3/4 of the larger one 
and is 0,794 long. Gubernaculum slightly 
curved, with the concave side turned to the 
ventral surface; length 0,144 mm. Anus 0,169 
from posterior extremity. 
Female: Excretory pore 0,646 mm. from 
anterior extremity. Tail rectilinear, sometimes 
slighty turned towards the ventral surface, fol- 
lowed by appendix, like that of male, 0,110 
mm. long. Vulva very prominent, with irre- 
gular rim, opening in the midle of the body, 
more or less at the junction of the anterior 
1,3 and the posterior 2/3. Ovijector long, tur- 
ned towards the cephalic end, that is it forwa- 
rds from the vulva and then bends back- 
wards; it measures 156 mm; vestibulum short 
(0,089 mm.), retort-shaped, with the neck 
abruptly curved at right angles. Sphincter 
small. Horn very long. (0,899 mm.). Uterus 
double, uterine hook-lets reaching from the 
first part of the intestine to a litle bey ond 
anus. Eggs elliptical, thin-shelled, containing 
embryos when laid, 0,033 mm. long and 
0,055 mm. wide. Anus 0,443 mm. from pos- 
terior extremity. 
Life History: unknown. 
Habitat: intestine of Strix sp. 
Origin São Paulo (Jacutinga). 
Material : Helminthologica) Collection of 
the Instituto Oswaldo Cruz nos. 1070, 1119 
and 1120. 
35. Subulura trogoni n. sp. 
(Plate XV, figs. 3 to 4). 
Dimensions: 
3 Length: 7,4 mm.; width: 0,572 mm. 
Q Length: 15,5 mm.; width: 0,858 mm. 
at the height of vulva. 
Body, white, rectilinear in the female 
