Pua og AA 
in the middle, disappearing at the level of the 
initial part of the intestine; length: 1,590 mm. 
Nerve collar placed at the height of the 
junction of 1/3 of front part and 2/3 posterior 
part of oesophagus, 0,372 mm. from the ce- 
phalic limit. Excretory pore on ventral sur- 
face, beyond the nerve ring, more or less in 
middle zone of oesophagus. Mouth limited 
by three indistinct lips, furnished with six 
small papillae in two lateral series, each one 
with three papillae, the central one a little 
larger than the lateral ones. Buccal capsule 
small, may be divided into two parts; a high- 
er sub-cylindrical one, narrowing in the mid- 
dle part, with walls made of strong layers 
of chitin; a lower and ampler one, containing 
three small teeth of rectangular shape, of 
which the front sides may be rounded like 
the fingers of a glove: length: 0,016 mm. 
Oesophagus rectilinar, terminal segment di- 
lated, pear-shaped: walls furnished with nu- 
merous transversal muscles and some longi- 
tudinal ones: length: 1,207. Bulb spheroid, 
joined to the oesophagus by a small canal, 
lodging three sub-triangular plates in the 
shape of an isosceles triangle, the sides of 
which are extremely chitinous: length 0,251 
mm.; width: 0,211 mm. Intestine with slight- 
ly accentuated initial dilatation, rectilinear 
in its length, ending by a differentiation in 
the form of a rectum, at the end of which is 
the anus. 
Male: Tail sharpening from the inferior 
limit of the sucker, decidedly curved towards 
the ventral surface, ending in on aculeiform 
formation 0,106 mm. in size. Sucker ellipsoid, 
without chitinous rim 0,143 mm. in length; 
the posterior end 0,503 mm. from the caudal 
extremity. Caudal expansions very much atro- 
phied. Papillae eleven pairs, thus placed: 
three preanal, large, ventral: one at the side 
of the sucker at the junction of superior 1/3 
and inferior, 2/3 one close to the anus, another 
at an equal distance from the anus and the 
sucker; two adanal, very large: one lateral, 
another sub-ventral: six post-anal ones of 
which two are larger and four ventral, equi- 
distant the two larger near the anus, the two 
lesser ones near the caudal extremity; two 
lateral: a large one at the height of the third 
ventral one, counting from the anus and one 
between the two last post-anal ventral ones. 
Spicules unequal in length and width: the 
lesser one being more voluminous and about 
2/3 of the length of the longer one: greatest 
length: 1,515 mm. width 0,019 mm; lesser 
one: length 1,105 mm.: width: 0.025 mm. 
Gubernaculum almost rectilinear with larger 
inner extremity; length: 0,160 mm. Anus 
0,211 mm. from posterior extremity. 
Female: Tail very sharp-pointed, ending in 
a chitinous appendix; 0,140 mm. in length. 
Vulva prominent, cleft-shaped, opening above 
the middle of the body. Oviduct long. (1,285 
mm.); vestibulum relatively short, with neck 
turned at an almost rectangular angle, towards 
the ventral surface, with thick muscular walls; 
lumen limited by thin chitinous layer: sphinc- 
ter small: horn very muscular, four times 
the length of the vestibulum. Uterus double, 
with hooks extending from the oesophagal 
bulb even beyond the anal orifice. Eggs 
elliptic, with very thin shell, with undeve- 
loped embryo when laid; length: 0,076 mm. 
width: 0,050 mm. Anus 1,285 from posterior 
extremity. 
Development: Unknown. 
Habitat: Intestine of Crotophaga ani L. 
and Crotophaga major L. 
Source: We described specimens from 
Crotophaga ani L. from Pernambuco (Recife- 
Varzea). 
Material: Nos. 1,087 and 1,088 of the 
Helminthological collection of the Institute 
Oswaldo Cruz. 
6. Subulura allodapa (Creplin, 1853) 
Railliet & Henry, 1913. 
Plate. II, Figs. 4 & 8; Plate. XII, Figs. 1 € 8: 
Dimensions : 
3 Length: 7to 10 mm.; width 0,33 mm. 
Q Length: 10 to 14mm.; width 0,44 mm. 
Body yellowish, straight in most of its 
length; anterior extremity like a truncated cone, 
generally inclined towards the dorsal surface; 
caudal extremity rectilinear and sharp-poin- 
ted in the female; ventrally curved like a 
fish-hook in the male, terminating in a cuti- 
