45 A WILLIAM NICOLL. 
Ventral sucker near the middle of the body, globular or 
slightly oval and not projecting much. (4sophagus short, 
bifurcation far in front of ventral sucker. Excretory vesicle 
simple, short. Genital aperture median, not far behind intes- 
tinal bifurcation. Cirrus-pouch long and slender, not extend- 
ing beyond ventral sucker. Vesicula seminalis convoluted, 
ductus ejaculatorius long; true pars prostatica absent, 
but prostatic cells present. Ovary on right side, imme- 
diately in front of testes, distinctly trilobate. Receptaculum 
seminis large, giving off Laurer’s canal directly. Yolk- 
glands extensive, filling up considerable part of neck. Yolk- 
follicles arranged peripherally, Ova without filaments, very 
variable in size, ‘(07-10 mm. by :04—06 mm. 
For Dist. genu Rud. I propose the new generic name 
Peracreadium, with the following definition : 
Small to medium sized ALLOCREADIINe, with elongated 
ovate, shghtly flattened body. Ventral sucker not very 
prominent, situated about the end of the anterior third of 
the body. (4sophagus short, bifurcation midway between 
suckers. Hxcretory vesicle simple. Genital aperture median, 
at intestinal bifurcation. Cirrus-pouch very long and slender, 
extending as far back as the level of the ovary (= about one 
third of the body length). Vesicula seminalis convoluted ; 
ductus ejaculatorius long; distinct pars prostatica pre- 
sent. Ovary globular, with entire margin, situated a little to 
the right side of the middle line, immediately in front of the 
testes or separated from them by a small part of the uterus. 
Testes usually transversely oval, with entire margin, situated 
about the middle of the post-acetabular region. Yolk-glands 
extensive, occupying considerable part of neck and filling up 
posterior part of body. Ova without filaments, very variable 
in size, ‘07-10 mm. by ‘03-06 mm. 
Habitat.—Lasripa, so far as known. 
Type.—Peracreadium genu (Rud.). Also P. com- 
mune (Olss). 
Between these two new genera the main differences consist 
in (1) the position of the ventral sucker; (2) the shape of 
