curved in a semi-circle in the male. Mouth 
round, surrounded by six small papillae. 
Buccal capsule long. Oesophagus ending in 
spherical bulb, communicating with the intes- 
tine, the initial part of which is dilated by 
means of a narrow canal. Excretory pore 
0,55 mm. from buccal orifice. 
Male: Tail bent towards the ventral sur- 
face; 1/50 of the length of body. Oesopha- 
gus 1,5 of body (LINSTOW) measuring 1,20 
mm. (SONSINO). One spicule strongly chiti- 
nised, curved, transversally, striated, ending in 
“a triangular point, 0,50 mm. (SONSINO) to 
0,56 mm. (LINSTOW) long. Accessory piece 
corresponding to 1,3 of spicule (SONSINO); 
0,15 mm. long (LINSTOW). Sucker elliptical, 
without chitinous rim. Ten pairs of genital 
papillae two of which are pre-anal. 
Female: Tail equal to 1/15 of body. 
Oesophagus 1,5 mm. (SONSINO), or 1,9 
(LINSTOW), long. Nerve collar 1,20 mm. 
from caudal apex (SONSINO). Vulva a little 
in front of the middle of body dividing it in 
the proportions 11:14. Ovijector voluminous, 
directed backward from front, composed of 
annular muscular fibres. Uterine hooklets 
reaching from oesophagean bulb to a short 
distance from anus, Eggs elliptical hatched; 
0,045 mm. (SONSINO) to 0,065 mm. (LINS- 
TOW) long, and 0,030 mm. to 0,047 mm. 
wide. 
Habitat: Caecum of Vulpes (Megalutis) 
zerda Zimm. and Vulpes (V) vulpes var. aegyp- 
tiaca Desm. 
Geographical distribution: Egypt. 
Oxynema boueti (Gendre 1911) Barreto, 
1917. 
(PI. XXI, figs. 1 to 6). 
Dimensions : 
d Length: 9,55 to 11,10 mm.; width: 
0,44 to 0,48 mnm. 
Q Length: 15,52 to 18,78 mm.; width: 
0,60 to 0,64 mm. 
Body straw-coloured, slender at extremi- 
ties in both sexes, especially at posterior one. 
Cuticle finely striated. Lateral expansions 
very short. Cephalic extremity truncate, con- 
tinuing the body. Mouth wide, circular, with- 
46 
out lips, surrounded by six fungiform, al- 
most equidistant papillae : four submedian and 
two lateral. Buccal capsule spacious, cylindri- 
cal, with three strong chitinous teeth. Pharynx 
short. Oesophagus thickening gradually until 
the posterior part; slightly dilated. Bulb sphe- 
rical. Intestine has initial dilatation larger 
than bulb, running straight to anus. Excretory 
pore on ventral surface on the anterior third 
of oesophagus. 
Male: Oesophagus equal to 1/55 of total 
length. Tail equal to 1,23 to 1,31,7. Posterior 
region of male ventrally curved, ending in 
sharp-pointed zonical tail, followed by appen- 
dix. Sucker oval, without chitinous rim. Cau- 
dal bursa formed by two highly developed 
expansions, reaching from sucker to termi- 
nal appendix. Eleven pairs of genital papil- 
lae, five pre-anal and six post-anal. Pre-anal: 
three sub-median, one at the level of the mid- 
dle part of sucker, another at equal distances 
from sucker and anus, the last near the cloa- 
ca, two lateral nearthe side of the anus. 
Post-anal: two large sub-median in anterior 
part of tail, two smaller ones near caudal 
extremity, two intermediate lateral ones near 
the pre-anal, the fourth post-anal is the smal- 
lest of all. One spicule only, bow-like, strong 
and delicately transversally striated, measuring 
0,94 mm. formed by two distinct parts one 
shorter cylindrical, ending in a funnel- 
shaped dilatation; the other sharp-pointed fur- 
nished with lateral expansions. Accessory 
piece hollowed out, abruptly dilated at base. 
Female: Oesophagus 1/7,6 to 1/8,4 of 
body; Tail straight, conical, ending in appen- 
dix like that of the male, corresponds to 
1/19 1/13,8 of total length. Vulva very 
prominent, visible tothe naked eye, transver- 
sal, opening in the anterior half of body; 
about 1/2,5 of body. Uterus double. Eggs 
round, thin-shelled, embryos developed when 
laid, 0,062 long and 0,052 wide. 
Habitat: intestine of Xerus (X) erythro- 
pus Geoff. 
Geographical distribution: Africa: Daho- 
mey, Agouagon. 
