O. LUNDBLAD: POLYARTEMIA AND BRANCHINECTA IN SWEDEN. 161 
dry up at the end of the summer. EKMAN says he has also 
found the species in similar waters. — The animals were 
caught on July 6th. 
Branchinecta paludosa (O. F. MÜLL.). — A great many 
specimens of this form were captured in a very shallow pond 
(depth 20 cm.) at a height of 1033 metres in Regio alpina 
close to the northern base of Helagsfjäll (on the Sth of 
July). Besides males and females, which were equally com- 
Fig. 2. Map, showing the distribution of Branchinecta 
paludosa in Scandinavia. 
mon, I also saw many young individuals, the smallest being 
about 4 a 5 mm. in length. Certain details seem to indicate 
that even the greatest specimens observed had not reached 
their maximum size; so, for instance, the sac-like marsupium 
of the female was not yet so much prolonged and did not 
hold any eggs. Owing to the sunny position of the pond 
and the very shallow water it was heated very quickly to 
considerable temperatures; so was the temperature of the 
water 2-7 18 @ at 10 arm. and + 222€. four hours later 
