— 31 
part of whole length. Vulva situated above 
the middle of body, dividing it into two parts, 
in the proportion of 11:15. Eggs numerous, 
0,049 long and 0,036 wide. 
Habitat; intestine of ÆEurystomus afer 
Gray. 
Geographical distribution: 
Lake Nyassa. 
21. Subulura rimula (Linstow, 1903) 
Railliet & Henry, 1913. 
Plate Ill, fig. 9. 
East Africa 
Dimensions : 
gd Length: 86 mm.; width: 0,34 mm. 
Q Length: 12 mm.; width: 0,58 mm. 
Cuticle transversally ringed. Cephalic ex- 
tremity obtuse, without lips or papillae. Tail 
end conical and sharp-pointed. Oesophagus 
ending in spherical bulb, measuring 1/7 of 
whole length in male and 1/8 in female. 
Male: Tail equal to 1/27 of length of 
body. Testicle leaving only the first fifth of 
body free. Spicules 0,88 mm. Ten papillae: 
three pre-anal and seven post-anal ones. 
Sucker elliptic, between the first and second 
pre-anal papillae, surrounded by radiating 
muscles, 
Female: Tale occupying 1/20 of body. 
Vulva at the junction of anterior third with 
two posterior thirds. Eggs almost round 0,049 
mm. long and 0,041 wide. 
Habitat: Centropus sinensis (Steph). 
Geographical distribution: Asia (Siam.) 
22. Subulura rima (Linstow, 1906) 
Railliet & Henry, 1913. 
Plate Hl fig. 8. 
Dimensions: 
S Length 8,2 mm.; width: 0,40 mm. 
Q Length 9,3 mm.; width: 0,43 mm. 
Cuticle with widely separated transversal 
rings. Mouth surrounded by six papillae: 
four large ones, one on each longitudinal 
line, and two lesser ones, one to the right 
and one to the left. Buccal cavity deep, lead- 
ing to oesophagus, at the opening of which 
are three nodules, each with a conical tooth. 
Oesophagus followed by bulb; in the male 
equal to 1/5,3 and in the female to 1/5 of 
whole length. Lateral expansions cephalic. 
Male: Tail 1/21 of the length of body. 
Spicules, the right-hand one equal to 0,48 
mm., the left 0,70 mm. Accessory piece. 
Sucker elliptical, situated very much to the 
front. Nine papillae: one by the side of suc- 
ker, three pre-anal and five post-anal ones. 
Female: Posterior extremity long, ending 
in a point, equal to 1/6,7 of total length. 
Vulva situated in front of middle of body, 
Separating it in two parts, in the proportion 
| of 51:53. Eggs not developed. 
Habitat: caecum of 
Houbara undulata (Desf). 
Outis houbara from Africa. 
Houbara macqueenii nec (Desf). (Becht). 
Outis houbara from Asia. 
Geographical distribution: LINSTOW, 
Studied the material from the Koenigsberg 
Zoological Garden, not mentioning whether 
the host were Asian or African. 
23. Subulura poculum (Linstow, 1909) 
Railliet & Henry, 1913. 
(Plate Ill fig. 5). 
Dimensions: 
S Length: 4,5 mm.; width: 0,28 mm. 
Q Length: 8,5 mm.; width: 0,43 mm. 
Cuticle with fine trasversal annelation. 
Lateral expansions cephalic. (?). Mouth sur- 
rounded by six papillae. Buccal capsule flat- 
tened. Oesophagus ending in bulb, repre- 
sents 1/5,3, in male and 1/8,5 in female of total 
bodily length. Nerve collar behind buccal ca- 
vity. Excretory pore in front of oesophagean 
bulb. 
Male: Tail equal to 1/29 part of body. 
Spicules long, slender-pointed, 0,79 mm, in 
length. Ten papillae: two pre-anal, two ad-anal, 
six post-anal. Sucker oval, surrounded by ra- 
diating muscles. Testicle reaching to initial 
part of intestine. 
Female: Tail conical and sharp-ponited 
equal to 1/9,7 of length of body. Vulva in 
front of the middle of the body, separating it 
in two parts in the proportion 20:33. Ge- 
nital organs stretch from beginning of oeso- 
