468 WILLIAM: NICOLL: 
lining of the sinus genitalis. A small number of “ Begleit- 
” surround the ductus. 
zellen 
Female Organs.—The ovary is situated on the right side 
of the body immediately in front of the testis, and just 
behind the ventral sucker. Its shape is not ‘ kegelformig,”’ 
as Jacoby describes it, but multilobate, the lobes having 
apparently no uniform arrangement. ‘l'his confirms Stafford’s 
observation. It is elongated in a direction parallel to the 
long axis of the testis, alongside which it lies, and it appears 
to be a little less than the testis in size. ‘he oviduct arises 
from its anterior surface and passes behind the ventral sucker 
towards the dorsal ‘surface. It dilates somewhat before 
siving off Laurer’s canal, and then bends forwards to receive 
the yolk-duct and pass into the ootype. Laurer’s canal is a 
tube of about ‘02 mm. diameter, which runs with several 
small convolutions to open on the middle line of the dorsal 
surface on the level of the posterior border of the ventral 
sucker, or a little in front of that. It is surrounded through- 
out its whole course by numerous small cells. There is no 
true receptaculum seminis. 
The yolk-glands are very limited in extent. They are 
exclusively lateral, lying to the outer side of, or even slightly 
ventral to, the ventral sucker. They extend from a little in 
front of the ventral sucker to near its posterior border. 
The follicles are few and of small size, and the cells have a 
great affinity for hematoxylin stains. The yolk-ducts run 
back alongside the intestinal diverticula, and unite in a small 
median receptacle situated at the level of the anterior end 
of the testes. 
Around the ootype and oviduct there is a fairly compact 
shell-gland of small size, but with numerous cells, the bodies 
of which do not stain readily, but the nuclei are very pro- 
minent. The latter are oval and about ‘005 mm. in size. 
The ootype passes forwards into the uterus, which describes 
numerous convolutions dorsal to the ventral sucker. The 
vagina runs straight along the anterior surface of the ventral 
sucker and opens into the genital sinus. The initial part of 
