STUDIES ON THE DIGENETIC TREMATODES. 425 
and to establish for them a distinct sub-family for which I 
propose the name SrEPHANOPHIALINE un. subfam., with the 
following provisional diagnosis. 
Small to under middle-sized forms with fairly muscular 
body, the anterior part of which is capable of considerable 
extension. Cuticle without spines or scales. Suckers mus- 
cular and of moderate size, the ventral sucker being situated 
at the end of the anterior third of the body or somewhat 
further back. Oral sucker with a circum-oral collar developed 
from the muscle substance of the sucker, from which a 
number (five or six) of small tentacular papille arise. Intestine 
with very short pre-pharynx, muscular pharynx, short 
cesophagus, and long simple diverticula extending to posterior 
end of body. Genital aperture median, between the suckers. 
Sinus genitalis small or vestigial. Cirrus-pouch elongated, 
with muscular walls. Vesicula seminalis and ductus ejacula- 
torius simple and not much convoluted. ‘Testes two, simple, 
median in the middle of the post-acetabular region. Ovary 
simple, rounded, not far behind ventral sucker and separated 
from testis by part of uterus. Receptaculum seminis and 
Laurer’s canal present. Yolk-glands mainly lateral, extensive. 
Uterus confined between anterior testis and ventral sucker. 
Vagina simple, short. Ova not numerous, measuring about 
‘05-08 mm. No intra-uterine segmentation. 
Type: Stephanophiala Mihi. Including also probably 
Crepidostomum Brn., and very doubtfully Acrodactyla 
Stafford. 
As a result of this separation Heymann’s definition of the 
sub-family Bunoperin® Lss. requires modification. The sub- 
family must for the present be restricted to the genera 
Bunodera and Patagium, and it is obvious that these 
genera differ from each other much more than Crepido- 
stomum and Acrodactyla do from Stephanophiala, not 
only as regards the circum-oral collar but also in respect of 
the internal structure. The modifications, as already indicated, 
are: Suckers nearly equal; testes oblique ; uterus extending 
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