par 
internal layer of longitudinal muscular cells 
lined with thin cuticular membranes with lon- 
gitudinal folds. Horn musculo-epithelial, very 
large: 4 mm. in the initial region; the epi- 
thelial cells in contact with the internal sur- 
face obscure the lumen of the canal; towar- 
ds the front the horn becomes larger, the 
high and narrow epithelial cells being subs- 
titued by large flat cells confining a large 
space full of eggs with embryos. The ovije- 
tor curves forwards, the horn curves back- 
wards and joins the uteri which reach down 
to the posterior extremity of the body, and 
then rise to the oesophagean region, where 
they continue with oviducts and ovaries side 
by side in front of the vulva. Eggs very nu- 
merous, thick-shelled, 0,055 mm. by 9,045 mm. 
Habitat : caecum of Caccabis rufa (L) and 
Caccabis petrosa Gm. (1) 
Geographical distribution: Africa, Bou- 
Saáda, Algeria. 
32. Subulura halli Barreto, 1917. 
(Plate XI, figs, 1, 2, 3 e 4.) 
d Length: 10,5 to 12 mm.; width: 
0,54 nim. 
@ Length: 13,4 to 16 mm.; width: 
0,6 mm. 
Male: Teeth cuneiform, sharp-pointed. 
Oesophagus with bulb, equal to 1/6,5 of 
body. Tail, tapering, ending in a fine point, 
often ventrally curved. Cloaca 0,5 mm. from 
posterior extremity. Caudal expansions nar- 
row. Eleven pairs of pedunculated papillae, 
five of which are pre-anal; the eleventh pair 
at the side of the sucker. Sucker 0,7 mm. 
from cloacal orifice. Spicules two, equal very 
long, (5 mm.) at the free end, with wing- 
like expansions, which are transversally stria- 
ted, and which widen at the sub-terminal 
part. Gubernaculum is 0,12 mm. long. 
Female: Body turned likea bow, the con- 
cave part being bent towards the dorsal sur- 
Note 1. This species was found by Seurat in the cae- 
cum of the red partridge in North Africa; the author 
does not give the scientific name of its host. In the Ca- 
alo gue ofthe Britsh Museum we find that the above no- 
menclature corresponds to the African red partridge. 
face, somewhat narrower at the ante- 
rior extremity, ending in a long, tapering, 
transparent tail, pointed at the end and cor- 
responding to 1/8,5 of total length. Oesopha- 
gus including bulb, equal to 1/7,5. Vulva in 
front of the middle part of body, in the an- 
terior 2/5 of the body. Ovijector with very 
short sphincter; horn first bent forwards, then 
suddenly bent backwards. Uteri reaching 
from the beginning of oesophagean bulb 
until 0,5 mm. from anus. Eggs 0,080 mm. 
long and 0,060 mm. wide. 
Habitat: caecum of Tetrax tetrax L. 
Geographical distribution: Africa, Maison- 
Carrée, Algeria. 
33. Subulura travassosi Barreto, 1918. 
(Plate XVI, figs. 1 to 5.) 
Dimensions: à 
The dimensions of this species vary in 
the specimens we obtained from Bucco swain- 
soni and Bucco chacuru; this difference may 
however be due to thepoor state of the ma- 
terial from Bucco swainsoni, in which the 
worms werc out of shape and very shrunk. 
Bucco swainsont. 
3 Length: 3,0 to 4,6 mm. width 0,230 
to 0,300 mm. 
® Length: 6,0 mm.; width: 0,410 mm. 
Bucco chacuru : 
S Length: 5,60 to 7,70 mm.; 
0,360 mm. 
“9 Length: 7,70 to 10 mm.: width: 
0,400 mm. 
Body whitish, with tapering extremities, 
the anterior part generally siraight, sometimes 
doisally bent; posterior part sharp-pointed, 
ending in an appendix, ventrally curved in 
the male, straight in the female. Smooth cu- 
ticle with fine transversal striations (0,001 dis- 
tant from one another) traversed longitudinal 
by two light lines and one dark line betwe- 
en the former. Lateral cephalic expansions 
very narrow (0,033 mm. wide), disappearing 
at the height of the bulb. Nerve collar in 
the anterior half of oesophagus. Excretory 
pore opening on ventral surface, a little be- 
yond nerve collar. Mouth ellipsoid, with in- 
distinct lips and six little papillae. Buccal ca- 
width: 
