42 
papillae two larger and four smaller ones, | not curved, and like the larger one has the 
Continuing the buccal orifice, a short ves- 
tibulum the walls of which are covered with 
thick chitinous cylindrical plates; it is more 
dilated in the posterior part where may be 
found three small subquadrangular, slightly 
sharp, teeth. Oesophagus rectangular with 
piriform dilatation at posterior extremity ; 
oesophagean walls muscular, especiaily at tne 
dilatation: lumen of oesophagus spacious and 
little chitinized in the two anterior parts, nar- 
rowing and covered with a thick layer of 
chitin in the posterior third of oesophagus 
1,10 mm. Bulb sub-spherical, lodged in the 
anterior extremity of intestine, which is di- 
lated to receive, it; it communicates with the 
oesophagus by means of a short passage with 
transparent lumen; three triangular strongly 
chitinised plates can be distinguished in the 
interior of bulb. Intestine dilated in the ini- 
tial part, rectilinear, ends in a small rectum 
with thin walls. 
Male: Caudal extremity funnel-shaped, 
curved, like a hook, towards the ventral sur- 
face. Sucker small with chitinous rim, 0,212 
mm. long; inferior limit 0,465 mm. from 
posterior extremity. Caudal expansions very 
reduced. Genital papillae eleven pairs in 
number arranged thus: three large ones 
pre-anal, ventrally of which one is at the level, 
of the middle part of the border of the 
sucker, one half-way between sucker and 
anus, another just above the anus: two ad- 
anal, voluminous ones: one ventral, the other 
lateral: six post-anal: four ventral and two 
lateral; the ventral ones are arranged in two 
groups, each group has two papillae: one group 
of larger papillae, near the cloaca another 
with smaller papillae near the caudal extre- 
mity; the lateral ones occupy the following 
positions: a large one between the two groups 
of ventral papillae, a very small one between 
the third and fourth ventral ones. Spicu- 
les two, very unequal of different length, 
width, and shape, accompanied by accessory 
piece; the larger spicule is sinuous, thin, 
weakly chitinised and spirally rolled, evagi- 
nated, about three times as Jong as the other; 
this latter one is very strongly chitinised, 
proximal extremity dilated, and the distal one 
sharp-pointed; length of larger one: 2,540 
mm.; width: 0,016 mm; of lesser one: length: 
0,960 mm.; width: 0,025 mm. accessory piece 
0,169 mm. long. Anus opens at the side of 
a little ridge, (0,186 mm.) from caudal extre- 
mity. 
Female: Posterior extremity rectilinear, 
aculeiform. Vulva not prominent, near middle 
ot body, more or less at the junction of the 
anterior 2/4 with posterior 3/5. Ovijector, 
1,136 mm. long, bent from anterior towards 
posterior extremity. The vestibulum, inter- 
nally covered with a thick layer of chitin, is 
formed by two very characteristic pieces. 
(vid. Plate XIX, fig. 2) and is in all 0,254 
mm. in size. Sphincter short, nearly always 
containing an egg, length 0,135 mm. Horn 
very muscular, curving before Opening into 
uterus. Uterus dichotomous, with diverging 
branches; uterine hooklets reach from first 
part of intestine to a little above anus. Eggs 
containing embryos when emitted, elliptical, 
with very thin shells 0,084 mm. long and 
0,067 mm. wide. Anus 1,156 mm. distant 
from caudal extremity. 
Development: unknown. 
Habitat: intestine of Playa cayanna 
(L). (1) 
Provenience: State of Rio de Janeiro, 
(Angra dos Reis, Ilha Grande) 
Material: from Helminthological Collec- 
tion of the Instituto Oswaldo Cruz, nos. 
1094 to 1098. 
38. Subulura olympioi Barreto, 1918. 
(Plate XX, figs. 1 to 5). 
Dimensions: 
S Length: 5,0 to 84 mm.; width: 0.411 
mm. 
Note. 1. The nematode parasite of Piaya cayana (L) 
(Cuculus Tringuaza ought to bear the name Subulura 
forcipata (Rud.). has according to this author equal 
spicule and lateral expansions. In our material, on the 
contrary the male has spicules widely different in length 
and aspect. We therefore think that it is not to be iden- 
tified with Ascaris forcipata Rud. (Specimina in intesti- 
nis caculorus seniculi, naevii et tringuaza reperta 
judging it to be a new species of Subulura. 
