STUDIES ON THE DIGENETIC TREMATODES. 4.4.9 
distinctly lateral genital aperture,! smaller ova, and round 
testes. Were it not for the lateral genital aperture it might 
readily enough be included in the genus Lebouria, and it 
is certainly more nearly related to this genus than it is to 
Podocotyle. This affinity may be indicated by re-naming the 
species (Lebouria) tumidula Rud, From the other Atto- 
CREADIIN®, Lebouria idonea is much more easily dis- 
tinguished. 
In proposing this species as the type of a new genus 
I have been influenced by the fact that it is impossible 
to include it under the genus Allocreadium IUss., and 
therefore its description as an Allocreadium sp. would 
have been erroneous. Moreover, it appears to be the repre- 
sentative of a group with features quite as well defined as 
those of Helicometraand Podocoty le, and further, it is not 
an isolated species, for in an American form described by 
Linton? from Bairdiella chrysura we have what must be 
regarded as an additional number of the genus. Linton’s 
work is, unfortunately for our present purpose, more of a 
bionomic than morphological character, so that his treatment 
of the species is not so exact as we might have desired. His 
figures, however, give a fairly good idea of the form, and its 
close resemblance to Lebouria idonea is not difficult to 
make out. We note the expanded shape of the body, the 
backward position of the ventral sucker with the intestinal 
bifurcation far in front of it, the oblique, or sometimes 
median, position of the testes, the round ovary, extensive 
yolk-glands, limited uterus, short cirrus pouch, and median 
genital aperture. With regard to the position of the genital 
aperture it is shown in fig. 168 midway between the ventral 
sucker and the intestinal bifurcation, but from the forward 
position of the ova it may possibly be found to be somewhat 
‘ Thave since found in Labrus bergylta a Distomid which I am 
inclined to identify as Distomum tumidulum, and in it the genital 
aperature is median or very slightly displaced. 
? «Bull. Bureau U.S. Fisheries,’ xxiv (1904), p. 389, pl. xxiii, figs. 168— 
170. 
