Tear86—Parasitic Worms From Wisconsin Fishes. 157 
mouth, and inside it. The posterior end of the male is coiled about 
three times. There is one short conical spicule, .025 by .015 mm., 
and one long signate spicule, .3 by .02 mm. 
Capillaria catostomi, new species 
(Fig. 10) 
Type: Cat. No. 7627, U. S. National Museum; Lake Michigan; 
Sturgeon Bay, Wisconsin; August 2, 1920; collector, A. S. Pearse. 
One female was examined and males are unknown. 
Host: the common sucker, Catostomus commersonii (Lacepede); 
intestine. 
Length of body, 8 mm.; width, .06 mm.; ulva, 2.55 mm. from 
anterior end; eggs .055 by .025 mm. 
The cuticle is smooth. There are one hundred eighty-seven cells 
in the esophagus and about seventy eggs in the uterus. The eggs 
are typically trichurid; lemon-shaped, with a plug at each end. 
Near the ulva they are arranged in a single row, but are more 
crowded together further back. 
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