180 Wisconsin Academy of Sciences^ Arts, and Letters. 
Neoechinorhynchus crassus Van Cleave 
Found in the intestine of the sucker in Lake Mendota, Lake 
Geneva, and Lake Michigan. 
Neoechinorhynchus cylindratus (Van Cleave) 
In the intestines of fishes as follows: Lake Mendota: largemouth 
black bass; Lake Pepin: Johnny darter, pickerel, both black bass, 
yellow perch, white bass, sauger, wall-eyed pike; Lake Michigan: 
sucker. 
Juvenile specimens occurred in the pickerel in Green Lake. 
Visceral cysts were found as follows: Lake Mendota: rock bass; 
Lake Pepin: pickerel, smallmouth black bass, white bass, sauger, 
wall-eyed pike; Green Lake: pickerel, smallmouth black bass. 
Octospinifer macilentus Van Cleave 
Occurred in the intestine of the sucker in Lake Geneva and 
Lake Michigan. 
Pomphorhynchus hulhocolli Linkins 
In the intestine of fishes: Lake Geneva: rock bass, sucker, both 
black bass; Lake Mendota: sucker, blunt-nosed minnow; Lake 
Pepin: sucker, a buffalo— Ictiohus cyprinella (Cuvier & Valencien¬ 
nes), white-nosed and short-headed suckers, skipjack; Green Lake: 
sucker; Lake Michigan: black bullhead, sucker, Iowa darter. 
Juvenile individuals were found in Green Lake in the following 
fishes: rock bass, speckled bullhead, top minnow, smallmouth 
black bass. 
Visceral cysts occurred as follows: Lake Geneva: rock bass, 
sucker, both black bass; Lake Mendota: yellow and black bullheads; 
Lake Michigan: speckled bullhead, sucker. 
Hirudinea 
Unidentified leeches were found as follows: Lake Mendota: rock 
bass, speckled bullhead, largemouth black bass; Lake Pepin: black 
and yeUow bullheads; Green Lake: rock bass, speckled bullhead, 
top minnow, largemouth black bass, yellow perch; Lake Michigan: 
lake trout, lota. 
