

where the h 
Mee eS Bare? Euphyllopoda ‘Was ves G 31 

w species may also occur in certain other ponds at Bernard harbour; 
atching of the eggs takes place a couple of weeks later, but then both 
_ sexes occur later in the fall than is the case with Branchinecta paludosa in this 
locality (p. 24). 
As to the life conditions of Artemiopsis it is interesting to note that Daday 
says (p. 175) that A. bungez seems to be an inhabitant of very frigid regions in 
eastern Siberia. The water of the lake in which it was collected, along the 
river Bolschaja Baranicha, had a temperature of only 1.1° Reamur. The 
temperature of the water at the other places where it was found (New Siberian 
islands, mouth of Lena river, etc.) are not given, but some of the specimens 
were collected on October 10, 1886, thus corresponding remarkably well with 
the records for A. stefanssonz given in this report. We may therefore, perhaps, 
consider Bernard harbour as the approximate southern limit for this latter 
species, and look for it to be found upon the islands composing the Canadian 
Arctic Archipelago. The temperature of the water in the pond less than one 
foot deep where I collected it, on October 6, 1915, at Bernard harbour, was 
33° F. (hole cut in ice), while the air temperature was 24° F. (1.30 p.m.; clear 
and calm.) ! 
The species is named in honour of the commander of the Canadian Arctic 
Expedition, Mr. V. Stefansson. Type-locality; Pond at Bernard harbour, 
Northwest Territories, October 6, 1915 (males and females); July 3, 1916 
(metanauplii). Many specimens, F. Johansen coll. Catalogue Nos. 1660, 1661, 
1662, Victoria Memorial Museum, Ottawa, Canada. 
Suborder CONCHOSTRACA. 
I did not observe any Phyllopods of this suborder during the Canadian 
Arctic Expedition; nor have they hitherto been recorded from the American 
Arctic or Greenland. As, however, I got a number of the species belonging to 
the two other suborders, besides Cladocera, I have hitherto attributed the 
absence of Conchostraca in the regions in question to their well known exceed- 
ingly erratic and sporadic occurrence where they are found; and even conjectured 
(Canadian Field-Naturalist, 1921, p. 88), that this suborder seems to be absent 
from the high-arctic regions.’ 
In June, 1920, I received, however, a letter from Dr. Chancey Juday, of 
the University of Wisconsin, telling me that Linmadia lenticularis L. was col- 
lected by J. M. Jessup in May-July, 1911-1912, in lakes on the coastal plain 
of the Arctic ocean (about lat. 69° 40’ N, 141° W.), according to specimens now 
in the United States National Museum. The species was also collected in the 
same year at Old Crow river, Alaska; and Lynceus (Limnetis) brachyurus in 
the same locality (north of New Rampart House), and at White Horse, Yukon 
Territory. These latter records from the subarctic parts of this continent are 
given in my semi-popular article quoted above. They represent the first records 
of Conchostraca in the arctic and subarctic regions of this continent; and it is 
interesting, that both of the species are Eurasian forms, hitherto not found in 
America; unless (as Sars thinks) L. lenticularis is the same species as L. americana, 
found in New England, and L. brachyurus the same as L. gouldi found in Canada 
and northern United States. . : 
It thus seems as if L. lenticularis just enters the American Arctic, perhaps 
only west of Mackenzie Delta, where the lines of isotherms, as well known, 
run much farther north than is the case in eastern Canada. | The species was 
originally described by Linnzeus from Finland; and is, according to Sars, found 
at a number of places in Scandinavia and central Europe. 

1 The stenothermal, cold water form of Copepods (Diaptomus bacilifer Koelb.), was also collected the 
same date in this pond (see Part J, p. 6-7 in this volume). 
2 The Bibliography given below is therefore limited to Notostraca and Anostraca. 
