32 G Canadian Ae 5 ‘: 3 




There is, perhaps, no other group of freshwater savertebeatadl wh 
so easily new facts and interesting biological features as the Crusta: 
only in the Arctic, but generally. Their seemingly erratic and sporadic 
rence; the influence of the various seasons of the year upon their life-c; y f 
the sudden “blooming forth” of certain forms in tremendous numbers in th 5 ae 
spring and early summer, and their disappearance as suddenly in the fall; these 
and other points have long made these freshwater-invertebrates particularly 4 
fascinating for study. RE 
It will be seen from the preceding pages, that the Phyllopods occurring in 
the Arctic present as interesting, biological features as these from farther south, 
though for certain species our information is as yet incomplete. For anybody 
who spends a whole year in the Arctic there should also be something inspiring ~ 
in the fact, so easily ascertained, that the rich life in bodies of fresh water, not 
to speak of the sea, continues all the year round, in spite of a low temperature eg 
and of many feet of ice covering them; and that each spring and summer invari- 
ably brings there also that exuberant vigor and fullness of life which is the 
characteristic of all living beings under favourable natural conditions. ‘a 
Ottawa, Canada, April, 1922. 
