152 Wisconsin Academy of Sciencesy Arts, and Letters. 
Length of body, 1.33 mm.; width, .37 mm.; diameter of oral 
sucker, .14 mm.; diameter of acetabulum, .22. Eggs, .04 by .16 mm. 
Cuticula minutely denticulate. 
Diameter of oral sucker slightly more than half that of ace¬ 
tabulum. No prepharynx. Pharynx, a little more than half the 
diameter of the oral sucker in length, spindle-shaped, about two- 
thirds as wide as long. Esophagus very slender, about two-thirds 
as long as the pharynx. Intestinal rami, slender, extending nearly 
to posterior end of body. 
Genital pore, median, a short distance anterior to the acetabulum. 
Ovary, ellyptical with the long axis across the body; .09 by .175 mm. 
Uterus between the ovary and the acetabulum, more on the right 
than the left side, containing as many as fourteen eggs. Vitelline 
glands forming large rounded follicles, about .05 mm. in diameter, 
which are distributed along margins of the body behind the 
acetabulum and across the posterior end. 
The testes are elongated, median, and immediately behind the 
ovary. The anterior one measures .09 by .17 mm. and its long 
axis extends across the body. The posterior testis measures .13 
by .21 mm. and its long axis is nearly longitudinal. The cirrus 
pouch is pyriform; length, .15 mm. It extends back to a little 
beyond the center of the acetabulum. 
The type was one of seven specimens taken from the intestines 
of four Johnny darters collected at the lower end of Lake Pepin, 
July 9, 1920. Three other specimens were found in the intestine 
of a log perch, Percina caprodes (Rafinesque), collected at the same 
place July 5,1920. 
Phyllodistomum superhum Stafford 
(Fig. 2) 
The writer is convinced that Stafford (1904) confused two 
species of the genus Phyllodistomum. Stafford’s name is therefore 
retained for the species which most nearly fits his description and 
a new name, P. staffordi, is given to the other. 
Length of body, 2.57 mm.; width, 1.5 mm. Diameter of ace¬ 
tabulum, .29 mm.; of oral sucker, .24 mm. Length of anterior 
testis, .38 mm.; of posterior testis, :52 mm.; of ovary, .22 mm. 
Size of egg, .022 by .033 mm. (Cat. No. 7623, U. S. Nat. Museum.) 
Anterior end of body narrow (.33 mm. wide) as far back as 
acetabulum, which is about 1.2 mm. from the anterior end. ^ Ex- 
