Pearse—The Parasites of Lake Fishes, 
173 
Gasterostomum pusillum Stafford 
In the intestine of the sauger in Lake Pepin. 
Leucerthrus micropteri Marshall & Gilbert 
In the intestine of the smallmouth black bass in Lake Geneva; 
white bass in Lake Mendota and Lake Pepin. 
Macroderoides spiniferus Pearse 
In the intestine of the yellow and speckled bullheads, and short¬ 
billed gar in Lake Pepin. 
Microphallus opacus Ward 
In Lake Mendota this species occurred in the intestines of the 
yellow bullhead, dogfish, silversides, smallmouth black bass. 
Phyllodistomum fausti Pearse 
Found in the urinary bladder of the sheepshead in Lake Pepin. 
Phyllodistomum staffordi Pearse 
In the urinary bladder to the black and speckled bullheads, and 
the mud cat in Lake Pepin; black and speckled bullheads in Lake 
Michigan. 
Phyllodistomum superhum Stafford 
Found in the intestines of a bream and several perch in Lake 
Michigan. 
Plagiorchis corti Lament 
In the intestine of the tadpole cat in Lake Mendota. 
Stephanophiala farionis 0. F. Muller 
In the intestine of the Johnny darter and a shiner, Notropis 
heterodon (Cope) in Lake Mendota; the yellow perch in Lake 
Michigan; the pumpkinseed in Lake Geneva. 
