176 Wisconsin Academy of ticiences, Arts, and Letters. 
Proteocephalus exiguus La Rue 
In the intestine of the cisco in Green Lake, and in two of the 
ciscoes in Lake Michigan. 
Proteocephalus macrocephalus (Creplin) 
In the intestine of the eel in Lake Pepin. 
Proteocephalus pearsei La Rue 
In the intestines of fishes as follows: Lake Geneva: yellow perch; 
Lake Mendota: yellow perch and white bass; Lake Pepin: yellow 
perch and log perch. Green Lake: pickerel and yellow perch; 
Lake Michigan: yellow perch. 
Proteocephalus perplexus La Rue 
Occurred in the intestines of fishes. Lake Mendota: yellow bull¬ 
head, dogfish, and pickerel; Lake Pepin: rock bass; Green Lake: 
blunt-nosed minnow. 
Visceral cysts were found in the white bass in Lake Mendota; 
in the speckled bullhead and blunt-nosed minnow in Lake Pepin. 
Proteocephalus pinguis La Rue 
Occurred in the intestines of the pickerel in all five of the lakes 
studied. Visceral cysts were found in the rock bass in Green Lake. 
Proteocephalus singularis La Rue 
Pound in the intestine of the long-nosed gar in Lake Mendota 
and in the short-nosed gar in Lake Pepin. 
Triaenophorus nodulosus Pallas 
Encysted visceral representatives of this species were found as 
follows: Lake Pepin: speckled bullhead and short-headed redhorse; 
Lake Michigan: sucker, long-nosed sucker, smallmouth black bass, 
and yellow perch. 
Trypanorhyncha, gen.? sp.? 
Visceral cysts occupied by representatives of this order were 
found in the yellow bass and skipjack in Lake Pepin; and in the 
top minnow in Lake Michigan. 
