182 Wisconsin Academy of Sciences, Arts, and Letters. 
COPEPODA 
Achtheres ambloplitis Kellicott 
In Lake Michigan on the gills of a cisco—^Leucichthys harengus 
(Richardson), the lota, and smallmouth black bass. 
Achtheres coregoni (Smith) 
On the giUs of the lake trout in Lake Michigan. 
Achtheres corpulentus Kellicott 
On the gills of a cisco —Leucichthys johannae (Wagner), in Lake 
Michigan. 
Achtheres micropteri Wright 
On the gills of the smallmouth black bass in Lake Geneva. 
Achtheres pimelodi Kroyer 
On the gills of the channel cat in Lake Pepin. 
Argulus sp. ? 
An unidentified Argulus was found on a carp in Lake Mendota. 
Argulus appendiculosus Wilson 
Found in Lake Pepin on the mud cat. 
Argulus catostomi Dana and Herrick 
Under the opercula and on the gills of suckers in Lake Geneva 
and Lake Mendota. 
Argulus maculosus Wilson 
Op the yellow bullhead in Lake Pepin. 
Ergasilus caeruleus Wilson 
On the gills of fishes: Lake Mendota: yellow perch; Lake Michi¬ 
gan: rock bass, sucker, a cisco —Leucichthys harengus (Richard¬ 
son), and yellow perch. 
