— 43 
© Length: 7,7 to 15,6 mm.; width: 
0,462 mm. at height of vulva. 
Body rectilinear, filiform, yellowish-white» 
tapering at the extremities. In the greater 
part of specimens the cephalic end is cylin- 
dro-conical, curved towards the dorsal surfa- 
ce; the caudal end sharp-pointed and ending 
in a chitinous appendix, straight in the fema- 
le; ventrally curved like a hook in the male. 
Cuticle of medium thickness (0,009 mm.), the 
superficial layer transversally striated; stria- 
tions being 0,003 mm. distant from one ano- 
ther. Lateral cephalic expansions disappea- 
ring a little below the bulb. Nerve collar si- 
tuated approximately at the height of the 
junction of the anterior 1/4 and the poste- 
rior 3/4 of oesophagus. Excretory pore opens 
on ventral surface, beyond the nerve collar, 
at the limit of the anterior 1/3 of oesopha- 
gus. Mouth without clearly individualised 
lips, surrounded by six small papillae, arran- 
ged in two lateral rows. Buccal capsule nar- 
row, the posterior segment being larger ; walls 
clothed with thick chitinous plates; teeth 
three in number, club-shaped, fcund at 
the entrance to the oesophagus. Oesophagus 
rectilinear, musculature very accentuated, dila- 
ted like a pear ar posterior extremity. Bulb 
spherical depressed towards posterior direc- 
tion, communicating with oesophagus. Intes- 
tine: anterior end chalice-shaped, containing 
the bulb and sloping gradually towards 
the ventral surface, where it endsin a short 
rectum. 
Male: Buccal capsule 0,041 mm. long: 
0,029 wide. Nerve collar 0,296 mm. from ce- 
phalic extremity. Excretory pore 0,465 mm. 
from same. Oesophagus 0,899 mm. long. 
Anterc-posterior diameter of bulb 0,179 mm. 
Transversal diameter: 0,231 mm. Caudal ex- 
pansions slightly developed. Sucker small, el- 
liptical, without chitinous border, 0,034 mm. 
long. and 0,033 wide. The posterior limit 
0,465 mm. from caudal extremity. Eleven 
pairs of papillae thus arranged, three large, 
equal pre-anal ventral: one at the side of 
sucker at the height of its higher boundary, 
one just below the sucker, another a litle 
above the anus; two ad-anal large equal 
ones; one lateral, the other sub-ventral; six 
post-anal five ventral and one lateral of the 
ventral ones: two large ones at the junc- 
tion of the anterior 1/3 and the posterior 2/3 
of the post-anal segment of tail, one at the 
level of the junction of the anterior 2/3 and 
the posterior 2/3 of the same, two small ones 
at posterior extremity, one very small one 
below the second post-anal ventral, at the 
point of insertion of the large lateral papil- 
lae. Spicules two, equal, strongly chitinised, 
transversally striated with sharp-pointed dis- 
tal extremities; generally evaginated; length, 
0,899 mm. width: 0,016 mm. Gubernaculum 
| straight, short (0,127 mm). Anus 0,228 mm. 
| from posterior extremity. 
Female: Buccal capsule 0,067 mm. long. 
0,033 mm. wide. Nerve collar 0,304 mm. 
from cephalic extremity. Excretory pore 0,474 
mm. from same. Oesophagus 1,128 mm. 
large. Bulb: longitudinal diameter 0,084 
mm.; transversal diameter, 0,093 mm. Vulva 
not prominent, small, opening a little above 
the middle of body. Ovijector short, (0,693 
mm.), directed from the vulval orifice towards 
the anterior extremity, vestibulum muscular 
with spacious lumen, 0,211 mm. long; sphinc- 
ter small (0,127 mm.); Horn short, abruptly 
bent towards the tail before reaching the 
uterus, 0,338 mm. in size. Uterus double, 
numerous coils enveloping intestine, filling 
the general cavity from bulb till beyond the 
anus. Ovaries arranged in opposite directions, 
in front of vulva. Eggs elliptical, thin-shelled, 
embryo developed before laid; length 0,067 
mm.; width: 0,050 mm. Anus 0,976 mm. from 
posterior extremity. 
Life History: unknown. 
Habitat: Intestine of: 
Crypturus parvirostris Wagler. 
Rhynchotus rufescens (Temm). 
Nothura maculosa (Term). 
Source: Minas Geraes (Lagõas Periodi- 
cas de Nova Granja: Lassance). 
Material: Helminthological Collection of 
the Instituto Oswaldo Cruz, nos. 1109 to 
1118. 
