196 
AN ACCOUNT OF SOME HBLMINTHES COLLECTED IN THE SUDAN 
Ti’ansvei'se section of the pouch is triangular with dorsally directed apex in : 
I G. crumenifcr from Bos taurus indicus, B. kerabau, India. 
Apex pointed , compressus „ Bos taurus indicus, India. 
Apex bifurcated— G. gregarms „ Bos bubalus, Egypt. 
Gastrothylax 
ivenyoni 
Transverse section of the pouch is round in ; 
G. spatiosus from Bos taurus, Arabia. 
Transverse section of the pouch is triangular with ventrally directed apex in ; 
G. synethes from Bos taurus. East Africa. 
G. mancupatus „ Bos taurus. East Africa. 
G. cobboldi „ Bos taurus, China. 
G. elongatus „ Bos taurus, Ceylon. 
G. mimitus „ Tragelaplius scriptus, German Cameroons, Africa. 
It will be seen from the above table that of the nine species recorded four are now 
known to occur in Africa, and that all save one are parasites of cattle. 
The specimens from the waterbuck show in transverse section a ventral pouch having a 
triangular outline, the apex of which is directed dorsally and divided at its tip by a ridge of tissue 
containing uterine coils and vas deferens (Fig. 48, B, C), thus resembling G. gregarius. The 
Laurer’s canal and the excretory duct unite to discharge by a common aperture — a condition 
(|uite unique in the genus, and one which, with a notable difference in the shape of the excretory 
vesicle itself and in the relationship thereto of its efferent duct, suffices to distinguish this 
form from all others (Fig. 46). I therefore recognise it as a new species, Gastrothijlax wenyoni. 
47.—Loni^itudinal section ot 
G. 7venyoni 
ph = pharynx 
4 .p. =6enital papilla 
oes. =c8sophagus 
v.p. =ventriil pouch 
t. =teBte8 
1 c. = Laurer’s canal 
p.s-=po8terior sucker 
ex.v. =excretory vesicle 
G. wenyoni measures from one third to one half inch in 
length and has a greatest transverse diameter equal to a third 
of the body length. It is pyriform in shape, the tw'o bulgings 
just in front of the posterior sucker being due to the large 
testes. 
The following characters are re¬ 
vealed in serial section ; the measure¬ 
ments given are from a specimen, 
so prepared, that measured 6'3 mm. 
X 2’1 mm. greatest diameters. Both 
suckers, anterior and posterior, are 
situated quite terminally. 
The posterior sucker is almost 
spherical in outline, its greatest trans¬ 
verse diameter is 1’2 mm., its vertical 
1 mm. The entrance to the sucking 
cup is 0'36 mm. across. The mus¬ 
culature in its greatest thickness, 
0'44 mm. The oral sucker is smaller 
than the ventral and is distinctly 
apple-shaped, 0'5 mm. x 0'5 mm.; it 
is continued by a narrow’ muscular 
CES0j)hagus, 0'7 mm., which bifurcates 
into the two main gut branches just 
below (0'2 mm.) the level of the 
Fig. 48—Transverse section of 
G, wtnyoiii 
(A) in region of pharynx 
^B) at level of genital papilla 
(C) region of testes 
v.p. = ventral pouch t.= testes 
