294 * The American Naturalist. [April, 
pools 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 belong to the following families: 
Sididee i 
Daphniide . 9 
Bosminidæ . ae 
Macrotrichiide . 4 
Lyncadæ 0: < «18 
Polyphemide . 1 
Leptodoridee 1 
30 
The distribution of the species is given in the following 
table: 
ASSINIBOIN RIVER. 
- Daphnia pulex DeGeer. 
Ceriodaphnia consors (?) Birge. 
Iliocryptus sp.? 
Chydorous sphericus O. F. Müller. 
Graptoleberis testudinaria var. inermis Birge. 
RAT CREEK AT MCDONNELL ON PoRTAGE PLAINS. 
Daphnia pulex DeGeer. 
Ceriodaphniia consors (?) Birge. 
Simocephalus vetulus O. F. Müller. 
Simocephalus serrulatus Koch. 
Scapholeberis angulata Herrick. 
Scapholeberis mucronata O. F. Müller. 
Eurycercus lamellatus O. F. Müller. 
Alona costata Sars. 
Graptoleberis testudinaria var. inermis Birge. 
Pleuroxus procurvus Birge. 
Pleuroxus excisus Fischer. 
Pleuroxus sp? 
