154 
IOWA ACADEMY OF SCIENCES. 
SOME MANITOBA CLADOCERA, WITH DESCRIPTION 
OP ONE NEW SPECIES. 
BY L. S. ROSS. 
No record is to be found among the literature upon Ento- 
mostraca, of any systematic work done upon this interesting 
division of the Crustacea in Manitoba, or any of the provinces 
of Canada. The region is yet open to the student of the distri- 
bution of the group. A short stay in the province of Manitoba 
in June, 1895, was utilized by the author in making a few col- 
lections from the region about Portage la Prairie on the Cana- 
dian Pacific railroad, fifty-five miles west "of Winnipeg. Before 
leaving the province some vials of alcohol were left with a resi- 
dent of the town to be filled with collections. A vial was 
received every second week from the time of the visit until cold 
weather, the latest being filled October 21, 1895. One vial 
remained to be filled the following spring. 
Collections were taken by the author from the Assiniboin 
river, from a deep, weedy slough which was once the channel 
of the Assiniboin river, from railroad ditches, and from prairie 
sloughs and ponds. A hurried visit to Lake Manitoba gave 
opportunity for a few hauls of the net among the rushes along 
the shore. 
An examination of the material obtained shows the presence 
of thirty species and varieties, one of which, and possibly two, 
is a new addition to the list of described species. 
The forms found belong to the following families: 
Sididse - 1 
Daphniidas 9 
Bosminidae - 1 
Macrothricidse.__ 4 
Lynceidae 13 
Polyphemidae 1 
Leptodoridae 1 
Total 
30 
