O ae 
specimens; the ends curved in opposite di- 
rections in males. Cuticle thick, the superficial 
layer furrowed by shallow transversal striati- 
ons, 0,0018 mm. one from the other; cuticle 
0,015 mm. thick. Lateral cephalic expansions 
slightly developed, reaching to the initial part 
of intestine; length 0,223 mm.; width 0,055 
mm. Nerve collar0,344 mm. from cephalic 
extremity. Excretory pore opening through 
a slight groove of cuticle, in the ventral sur- 
face of the body, beyond nerve collar. Mouth 
with slightly accentuated lips, surrounded by 
six equal, small papillae. Buccal capsule sha- 
ped like the segment of acone, larger in the 
posterior part, its walls with a covering of 
chitin of a peculiar form, length 0,045 mm.; 
width: 0,038 mm. Teeth three, subrectangular 
at the base of buccal capsule; length: 0,026 
mm. Oesophagus rectilinear, dilated in the pos- 
terior part; moderately muscular. Bulb sub- 
spherical; transversal diameter larger than 
the antero-posterior one, containing strongly 
chitinised plates; length: 0,279 mm.; width: 
0,353 mm. Intestine dilated like a calix; the 
first part, in which the bulb penetrates has 
a small rectum in the terminal segment, 0,232 
mm. long. 
Male: Excretory pore 0,620 min. from 
anterior excremity. Tail tapering, ventrally 
curved, with formation of aculeiform chitin 
rectilinear 0,093 mm. Sucker small, ellipsoid, 
without horny rim, 0,423 mm. from caudal 
extremity; longitudinal diameter of sucker 
0,186 mm. Caudal expansions quite rudi- 
mentary. Twentytwo papillae arranged in 
two paralely rows, beginning at the level 
of the middle part of the rim of sucker; three 
preanal, ventral; a very large one at the level 
of the middle of the rim of sucker two smal- 
ler ones near the anus: two voluminous ones 
ad-anal, lateral, six post-anal; of which four 
ventral and two lateral; of the four ventral 
ones two large ones near the anus and two 
smaller ones close to the caudal extremity; 
of the lateral, one voluminous at the 
height of the third ventral papilla counting 
from the anus, one very small one between 
the iwo last ventral. Spicules equal, in shape 
long and wide, almost rectilinear, with very 
sharp-pointed and slightly curved distal ex- 
tremity; length 0,558 mm. width 0,038 mm 
Gubernaculum curvilinear, measuring 0,228 
mm. Anus 0,232 mm. from posterior extre- 
mfty. 
Female: Excretory pcre 0,560 mm. from 
anterior extremity. Tail rectilinear, aculeiform, 
followed by chitinous appendix, 0,186 mm. 
long. Vulva small, slightly prominent, opening 
beyond the middle part of body. Ovijector 
slightly developed, with muscular Jayer. Vesti- 
bulum retort-shaped. Horn winding diffi- 
cult to see on account ofthe hooklets which 
almost cover it and hide it from view. Ute- 
rus duplex, with divergent branches, coiling 
a great many times; the coiis are full of eggs 
in different degrees of segmentation and 
reach from the nerve collar to beyond the 
anal orifice. Almost round, thin-shelled eggs 
containing embryos before they are laid; 
length 0,068 mm. width 0,060 mm. Anus 
1,176 mm. from posterior extremity. 
Development: unknown. 
Habitat: intestine of Trogon viridis L. 
Comes from Rio de Janeiro (Angra dos 
Reis). 
Material: Helminthological collection of 
the Instituto Oswaldo Cruz no, 1076. 
36. Subulura bentocruzi. 
(Plate XVIII, figs. 1, 2 and 3). 
Dimensions : 
S Length: 7,7 mm.—16 mm.; width: 
0,436 mm. in míddle part of body. 
9 Length: 13 mm-21 mm.; width: 
0,643 mm. at the height of vulva. 
Body yellowish-white, with the cephalic 
part a little curved towards dorsal surface; 
caudal part almost straight in the female, ven- 
trally curved in the male. Cuticle very thin, 
with transversal striations, 0,0029 mm. dis- 
tant one from the other. Lateral cephalic ex- 
pansions slightly developed, reaching to a 
little beyond the oesophagean bulb, about 
1,970 mm. long. Nerve collar 0,372 mm. from 
anterior extremity. Excretory pore a little 
behind the nerve collar. Mouth hexagonal, 
with indistinct lips, surrounded by six papil- 
lae, small, equal in size and arranged in two 
