Lie” ee 
of oesophagus. Excretory pore opening a 
little behind the nerve collar. Intestine large 
in the initial part, narrowing towards the 
anus. 
Male: Oesophagus equal to 1/9 to 1/11 of 
the body in length. Tail 1/51 part of body, 
curved like a fish-hook, ending in a very 
sharp point. Sucker cleft-like, without chiti- 
nous ring, 200 micra long, 1,5 mm. from 
anus. 
18 pairs of caudal papillae: two in front 
of sucker: two at the same height as sucker: 
“six between sucker and cloaca: three adanal 
one of these being lateral, and five post-anal 
of which oneis lateral, and one single one 
median above the cloacal orifice. The last pre- 
anal, the two ventral ad-anal and the two first 
post-anal support each a spartially developed 
expansion on side. Spicuies egual, without 
alae, transversally striated, the anterior extre- 
mity dilated, the posterior sharp-pointed: 
length 1,9 mm.; gubernaculum, 295 micra- 
Genital tube begins a little behind the anterior 
extremity of the spicules, goes straight for- 
wards and becomes hook-like 3,9 mm. behind 
oesophagean bulb. 
Female: Oesophagus about 1/12 of 
the body in length. Tail straight, conical, sharp- 
pointed, about 1/20 of body. Vulva opening 
in middle of body, which it divides in the 
proportions 2: 3. Ovijector turned back- 
wards, relatively short, with cylindrical ves- 
tibulum, measuring 640 micra in length, and 
140 micra in width, followed by a horn 
which opens obliquely by means of a val- 
vule protected by a sphincter. Horn short, 
410 micra long and 125 micra wide. Uterus 
single, 10 mm.in length, with hooklets turned 
backwards in the first part, which is 2,25 
mm. in length and 200 micra in width: 
single in the beginning, afterwards divided 
into two parallel reservoirs; greatest dia- 
meter 200 micra, full of eggs. 
Uterine hooklets stretch forwards until 
320 micra from the bulb and backwards to 
960 micra from tail. Eggs sub-globulous, 72— 
89 micra in length and 50-64 micra in 
width; the medium being 75-61 micra. 
Habitat: intestine of Sciurus prevosti raf- 
flesi (Vigors & Horsfield). 
Geographical distribution: Sumatra. 
31. Subulura seurati Barreto, 1917. 
Plate IX figs. 1, 2 and 5. 
Dimensions: 
S Length: 14,5 mm. width: 0,49 0,50 
mm. 
2 Length: 12,5 mm.; width: 0,585 mm. 
Body of sanguinolent colour, thick, very 
tapering at posterior extremity, with two la- 
tera] expansions in the cephalic and oesopha- 
gean regions; lateral spots very apparent on 
account of their dark colour. Mouth hexago- 
nal, drawn-out, with great dorso-ventral axis 
surrounded by six papillae. Buccal cavity with 
three small teeth at the base. Oesophagus 
dilated in the posterior region, continuing by 
clearly distinct bulb, with denticular appara- 
tus. Nerve collar at the anterior third of 
oesophagus. 
Male: Cloaca 0,43 mm. distant from cau- 
dal extremity. Sucker elliptic, drawn-out 
length ways, without chitinous ring. Caudal ex- 
pansions narrow. Eleven pairs of papillae, 
of which five pre-anal; three of these ada- 
nal and the last at the siue of the sucker. 
Spicules unequal, proportions 3-2, measuring 
respectively 1,35 mm. and 0,85 mm. Guber- 
naculum triangular 0,15 in length. 
Female: Tail conical, comparatively short, 
1,14 mm. long. Vulva situated in anterior re- 
gion of body at 1/3 of its length. Ovjector re- 
markably large, more than 5 mm. Vestibu- 
lum piriform, bent towards the front, with 
thick internal cuticle, containing a small num- 
ber of eggs, at most three. The sphincter is 
so united to the vestibulum as to allow of 
the free passage of the eggs; the walls of 
the sphincter are so elastic that reverse pas- 
sage is impossible. Sphincter very long, and 
divided into three parts; the initial region re- 
markably muscular and thickly clothed with 
cuticle; the middle part globulous, charateri- 
sed by a thick external and internal secretory 
layer, becomes highly coloured with methy- 
lene blue; in thispart the eggs remain some 
time; the last part is distinguished by a thin 
