STUDIES ON THE DIGENETIC TREMATODES. A477 
mm. It is situated at the end of the first third of the body 
length. 
The pre-pharynx is extremely short; the pharynx is broad 
and measures ‘07 by ‘09 mm. ‘There is practically no 
cesophagus and the simple straight diverticula extend to 
within a short distance of the posterior end of the body. 
The genital aperture les immediately in front of the ventral 
sucker, median or very slightly to the left. The cirrus- 
pouch bends round to the right side of the ventral sucker. 
It differs in shape from that of most members of the genus, 
approaching most nearly that of Plagiorchis (Lepo- 
derma) ramlianus (Lss.). It is short and stout and does 
not extend beyond the posterior border of the ventral sucker. 
It is somewhat pointed at its proximal end, where it receives 
the vas deferens. The vesicula seminalis is oval with only the 
slightest trace of a constriction, and measures ‘14 by ‘07 mm. 
The prostate cells are fairly numerous, surrounding the 
first half of the ductus ejaculatorius and pars prostatica. In 
this specimen the cirrus was exserted as a long, narrow, 
sinuate filament, pointed at the end and measuring *25 mm. 
in length. The vagina runs up tothe genital aperture on the 
left side of the ventral sucker. The arrangement of the 
genital glands is the same as that in the other members of 
the genus. The anterior testisis ‘20 mm. behind the ventral 
sucker, and the posterior testis is °35 mm. from the posterior 
end of the body. Between the testes there is a space of 
‘lL mm. ‘They are about equal in size, measuring °*25 by 
"16mm. They are elongated in the long axis of the body, 
and they he to the inner side of the intestinal diverticula. 
The ovary is situated further forward than in any other 
species of the genus. It les on the right side with its 
anterior border contiguous with the end of the cirrus-pouch, 
or on the level of aperture of the ventral sucker. It also 
lies to the inner side of the right intestinal diverticulum, but 
slightly overlaps it. It is longitudinally oval and measures 
"16 by -12 mm. From its inner side the oviduct arises and 
runs towards the middle of the body, where it gives off 
