Pearse—Parasitic Worms From Wisconsin Fishes. 153 
panded posterior portion is crinkled on margins. Posterior end, 
notched. 
The esophagus is slender, and about .35 mm. in length; the 
intestinal rami are slightly lobate and reach to or a little beyond 
the posterior end of the posterior testis; diameter, about .15 mm. 
The genital pore is about midway between the anterior margin 
of the acetabulum and the junction of the intestinal rami. The 
testes are lobate. They are of about the same width but the pos¬ 
terior one is longer than the anterior. Though the testes lie in 
about the same relative positions as in P. fausti, they are never in 
contact, but are separated by a distance of about .1 mm. The 
space between them is occupied by about two loops of the uterus. 
The ovary is elongated and irregularly lobate. It lies on the 
right side, about .1 mm. posterior to the vitelline gland. The two 
vitelline glands, though elongated and pyriform, are rather irregu¬ 
lar in outline. The uterus is filled with eggs and clearly arranged 
in coils. It is coiled throughout the posterior portion of the body 
posterior to the acetabulum. A few loops extend forward between 
the vitelline, glands to about the middle of the acetabulum. 
This trematode is not uncommon in the urinary bladder of the 
yellow perch, Perea flavescens Mitchill, from two Wisconsin lakes— 
Green Lake and Lake Michigan. Stafford (1904) apparently found 
this species at Montreal, Canada. The specimens from which the 
writer’s description was made were collected at Sturgeon Bay, 
July 30, 1921. 
Phyllodistomum fausti, new species 
(Fig. 1) 
Type: Cat. No. 7625, U. S. National Museum; Lake Pepin, Wis¬ 
consin; June 26, 1920; collector, A. S. Pearse. Fifteen specimens 
were taken from a single sheepshead. 
Host: Aplodinotns grunniens Rafinesque; urinary bladder. 
Length, 4.77 mm.; width, 2 mm.; diameter of oral sucker, 
.45 mm.; diameter of acetabulum, .7 mm.; egg, .037 by .028 mm. 
Body very flat, widest at junction of middle and posterior thirds; 
anterior third narrow, tapering toward anterior end. Middle por¬ 
tions of lateral margins crinkled. 
Esophagus, .7 mm. in length; about .05 mm. in diameter. In¬ 
testinal rami about .1 mm. in diameter; reaching to the posterior 
fifth of the body. 
