58 



Gr. 0. SAES. 



[No. 1. 



bottom of the aquary, tkere were some, however, the upper part 

 of which exhibited a rather dark opaque appearance, thus calling 

 to mind the so-called ephippial formation, found in the Cladocera 

 in connection with the deposition of the winter-eggs. But in none 

 of the shells were any traces of ova to be detected. Believing the 

 ova might previously perhaps have been deposited in the mud. 

 I have preserved the bottom-material of the aquary in a driecl 

 state, purposing next summer to institute a fe w hatching experi- 

 ments with it. 



On the lOth September I found in another, smaller, aquary, 

 prepared with mud from the same locality a short time before I 

 left Christiania, two living specimens of the above-described 

 Phyllopod, but somewhat smaller than those first hatched in the 

 other. Both specimens had young broocl within their incubatory 

 cavity, and seemed to be in a much more healthy condition than 

 those found on my return in the other aquary. They were, how- 

 ever, anything but active, resting, as they did, the greater part of 

 the time embedded within some dense dusters of Confervæ grow- 

 ing on the walls of the aquary. The young were safely hatched 

 from one of the specimens, but towards the end af September 

 both the young and the adult animals died, apparently owing to 

 the unusually cold weather happening to set in at that time. 



