OBSERVATIONS ON PARASITIC WORMS 
FROM WISCONSIN FISHES 
A. S. Pearse 
The following descriptions of trematodes and nematodes from 
Wisconsin fishes relate partly to new species and partly to those 
that have been inadequately described or confused by previous 
writers. 
TREMATODA 
AGETODEXTRA, new genus 
Flattened Distomata having the acetabulum on the right of the 
median line. Genital aperture between the acetabulum and the 
junction of the intestinal rami; situated somewhat toward the right 
side. Cirrus sac very small. Two more or less linear testes lie on 
either side at the posterior end of the body, between the intestinal 
rami and the median excretory duct. Ovary, somewhat lobate, 
elongated, near the center of the body. Uterus with many coils; 
extending across the body from the acetabulum nearly to the pos¬ 
terior end. Intestinal rami reaching nearly to the posterior end of 
the body. 
Type species: Acetodextra amiuri (Stafford). 
Acetodextra amiuri (Stafford) 
(Fig. 6) 
Stafford (1900) assigned this species to the genus Monostomum, 
believing that no acetabulum was present, though his figure plainly 
shows one. He was doubtless deceived by the fact that the acetabu¬ 
lum always lies to the right of the median line. The following 
description supplements his: 
Length: 3.6 mm.; width: 1.8 mm.; pharynx, .14 by .10 mm.; 
length of esophagus: 25. mm.; diameter of oral sucker: .185 mm.; 
diameter of acetabulum: .277; egg: .035 by .026 mm. 
