PARASITES FROM THE SOCTETY’S GARDENS, 151 
long fusiform pars prostatica and a long curved ductus ejacu- 
Jatorius. 
The testes are two irregularly lobed bodies lying behind the 
cirrus-pouch. The anterior is just behind the genital aperture 
but on the right side of the body. The posterior hes between 
the ends of the intestinal diverticula, and is separated from the 
end of the body by a space equal to its own diameter. 
Between the testes les the much smaller ovary. It is also 
irregularly lobed, but not so distinctly as the testes. It is 
separated from the posterior testes by a large yolk receptacle. 
The yolk-glands extend a considerable part of the length of the 
intestinal diverticula and le both internally and externally to 
them, but not to any great extent dorsally or ventrally. Their 
anterior limit is midway between the intestinal bifurcation and 
the ventral sucker. Posteriorly they cease at the ends of the 
intestines. The uterus is extremely short and does not usually 
contain more than two eggs. The latter are comparatively huge 
but very variable in size. The normal size appears to be about 
"15-18 x:08-11 mm. They lhe alongside the ovary and testes. 
This species evidently bears a close resemblance to the genus 
Harmostomum, but differs from it particularly in the position of 
the uterus and the size of the eggs. 
HoLoSstTOMATA. 
11. HemistomuM CANALICULATUM, sp.n. (PI. IV. fig. 11.) 
A few specimens of this parasite were obtained from the 
intestine of an Egyptian Eagle-Owl (Bubo ascalaphus). It is 
of moderate size, 1:6-2°9 mm. in length. The anterior part of 
the body is considerably longer than the posterior part, in the 
vatio of 5: 3 on an average. When expanded the anterior part 
cf the body is almost oval in outline, with a pointed tip. The 
lateral glandular pits are not very well marked. When con- 
tracted the body is almost uniformly cylindrical. The long axis 
of the two parts are almost in the same straight line; so that 
there is little dorsal flexure. The posterior part of the body 
may attain a breadth of ‘7 mm. 
The small oral sucker measures ‘08-09 mm. The ventral 
sucker is slightly larger (‘1 mm.), and is situated at a distance 
of -6 mm. from the anterior end in a specimen 2°4 mm. long. 
The pharynx is contiguous with the oral sucker and somewhat 
larger than it, measuring “08-1 x -06--08 mm. The short 
esophagus measures only -03—C4 mm. The diverticula have 
the usual configuration. 
The most characteristic feature of the species is the clinging- 
plug, which is situated immediately behind the ventral sucker. 
It is an oval structure about four times as long as the ventral 
sucker and two or three times as broad. It does not conceal 
