Pearse—Parasitic Worms From Wisconsin Fishes. 151 
Allocreadium ictaluri, new species 
(Fig. 5) 
Type: Cat. No. 7621, U. S. National Museum; Lake Pepin, Wis¬ 
consin; July 3, 1920; collector, A. S. Pearse. Other specimens 
were found in the same host at the same locality July 8, 10. 
Host: let alums punctatus (Rafinesque), the channel catfish. 
Length of body, 5.9 mm.; width, 1.85 mm. Diameter of aceta¬ 
bulum, .63 mm.; oral sucker, .5 mm.; pharynx, .3 mm. Cirrus sac, 
.45 by .25 mm. Egg, .08 by .045 mm. 
Cuticula smooth except on the suckers, where it is rough. The 
acetabulum is slightly larger than the oral sucker. The latter is 
situated on the ventral surface close to the anterior end. The 
acetabulum is in the anterior end of the middle third of the body. 
A very short and wide prepharynx connects the oral sucker and 
the pharynx, which is nearly spherical in form. There is appar¬ 
ently no esophagus. The intestinal rami are about .37 mm. in 
diameter and reach nearly to the posterior end of the body. 
The genital aperture is on the median line at a point nearly half 
the distance from the acetabulum to the pharynx. The cirrus sac 
is broad, ovate, and reaches to the anterior margin of the aceta¬ 
bulum. The two testes lie in the anterior portion of the posterior 
third of the body. They lie on the median line. The posterior 
one is somewhat lobate and the anterior one is elongated with its 
axis across the body. 
The vitelline glands extend from the pharynx to the posterior 
end of the body. They are absent for a space of about .25 mm. on 
either side of the acetabulum. They stain most heavily near the 
lateral margins of the body but a few occur throughout the middle 
portion also. The uterus is coiled between the posterior border of 
the acetabulum and the anterior testis. It contains about six 
hundred eggs. The ovary is spherical and lies about .1 mm. pos¬ 
terior to the acetabulum. 
Allocreadium boleosomi, new species 
(Fig. 4) 
Type. Cat. No. 7622, U. S. National Museum; Lake Pepin, Wis¬ 
consin; July 9, 1920; collector, A. S. Pearse. 
Host: the Johnny darter; Boleosoma nigrum; intestine. 
