Euphyllopoda g 31 



This new species may also occur in certain other ponds at Bernard harbour; 

 where the hatching of the eggs takes place a couple of weeks later, but then both 

 sexes occur later in the fall than is the case with Branchineda paludosa in this 

 locality (p. 24). 



As to the life conditions of Artemlopsis it is interesting to note that Daday 

 says (p. 175) that A. bungei 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. stefanssoni 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 Conchosteaca. 



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. gouldii 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 Linnffius 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 hacilijer 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. 



