Pearse—Parasitic Worms From Wisconsin Fishes. 155 
oval lobules. They are .15 mm. apart and about the same distance 
from the posterior margin of the acetabulum. The uterus is coiled 
between and posterior to the testes, largely between the intestinal 
rami. It does not come close to the lateral or posterior margins; 
its coils do not lie very close together and do not contain a con¬ 
tinuous series of eggs, but discontinuous groups. 
In writing descriptions of the three species of Phyllodistomum, 
the writer has examined specimens as follows: the first figure in¬ 
dicating the number of phyllodistomes and the second the number 
of fishes from which they came: P. fausti, 14-1; P. superhum, 
11-7; P. staffordi, 18-5. The following key separates the three 
species: 
Key to Species of Phyllodistomum in United States Fishes 
1 (2) Anterior, narrow, portion of body separated from discoidal portion 
by a distinct groove; testes not extending into posterior quarter of 
of body; esophagus not longer than oral sucker; uterus containing 
scattered groups of eggs, not reaching near margins of body; 
vitelline glands lobate...P. staffordi 
2 (1) Anterior, narrow, portion not separated from the posterior portion 
by a groove; posterior portion not discoidal, crinkled more or less 
along margins; esophagus longer than oral sucker; eggs close to¬ 
gether in uterus; vitelline glands pyriform. 3 
3 (4) Post-acetabular portion of body widest just behind the acetabulum; 
testes somewhat separated; posterior margin of body with a distinct 
median notch.P. superhum 
4 (3) Post-acetabular portion of body widest in middle; testes close to¬ 
gether; posterior margin of body without a distinct notch.P. fausti 
NEMATODA 
Ascaris lucii, new species 
(Fig. 12) 
Type: Cat. No. 7613, U. S. National Museum; Lake Michigan, 
Sturgeon Bay, Wisconsin; July 23, 1920. Other specimens were 
collected from the same host at the same place on July 20, 21, 1920. 
Host: the pickerel, Esox lucius Linnaeus; intestine. 
No males of this species were obtained, but eleven females were 
examined. 
