PARASITES FROM THE SOCIETY'S GARDENS, 141 
intestinal bifurcation. The cirrus-pouch is short and _ stout, 
measuring *8x°34 mm. It is almost oval in outline. Within it 
there is a small convoluted vesicula seminalis, with a moderately 
long pars prostatica and a short ductus ejaculatorius. The vagina 
is somewhat shorter than the cirrus-pouch. 
The small globular ovary is situated a short distance behind the 
ventral sucker on the right side and is largely concealed by the 
uterus. The anterior testis lies on the left about 1 mm. behind 
the ventral sucker, while the posterior testis les a little further 
back on the right side. Both are almost entirely concealed by 
the uterus, so that their size and shape could not be determined. 
They are, however, apparently elongated oval in outline. The 
yolk-glands are scanty, consisting on each side of a little more 
than a single row of follicles external to the intestinal diverticula, 
and extending from midway between the genital aperture and 
the anterior edge of the ventral sucker to the level of the anterior 
testis. 
The uterus fills up the greater part of the posterior two-thirds 
of the body. It consists of a narrow descending limb and a very 
greatly distended ascending limb, which is twisted into slight 
folds. The extremely numerous ova are dark brown in colour 
and measure -039 x ‘018-020 mm. 
This species bears a very close resemblance to the genus 
Lechriorchis, but is distinguished from it by the position of the 
genital aperture and the shape of the cirrus-pouch. 
2. OMMATOBREPHUS SINGULARIS, gen. et sp.n. (Pl. I. fig. 2.) 
A single specimen of this species was obtained from the 
intestine of the Spiny-tailed Mastigure (Uromastia acanthinurus). 
It presents several features of interest. 
The length of the specimen, slightly pressed, is 2°73 mm., and 
the maximum breadth across the ventral sucker is°8 mm. The 
anterior part of the body is considerably attenuated, the posterior 
part is more rounded but terminates in a somewhat acute point. 
There are no cuticular spines. 
The subterminal oral sucker has a diameter of °18 mm. and 
the ventral sucker measures 53 mm. ‘The latter is situated ata 
distance of 1:06 mm. from the anterior end, Contiguous with 
the oral sucker is a large pharynx, measuring ‘12°14 mm. 
This is followed by a long cesophagus, °3] mm. in length. The 
intestinal bifurcation takes place a little in front of the ventral 
sucker, and the short diverticula terminate about midway between 
the ventral sucker and the testes. 
The excretory vesicle is Y-shaped with a short sinuous stem, 
bifurcating a little in front of the testes, and limbs extending 
nearly to the level of the pharynx. 
The genital aperture is median, just over the intestinal bifur- 
cation. The cirrus-pouch is stout and almost globular, lying 
almost entirely in front of the ventral sucker. Its length and 
diameter are about *2 mm, It is thin-walled and contains a thick 
