




it bts « tate ae X: i | 
146 Canadian Arctic Expedition, 1913-191. Tater 
rae as Paar ay See 
Murdoch’s specimens of Polyartemia hazeni all came from the vic 
Point Barrow, Alaska, and apparently these were the only ones Dada: 
Dées had for basing his description and figures on. Through the kindness 
Prof. Paul Bartsch, of Washington, D.C., the Murdoch specimens of this specie 
now in the United States National Museum were sent for examination in 1920, 
and as the collecting data in Murdoch’s report are somewhat indefinite, I here 
quote the specimen-labels: 2 specimens (male, female with eggs), cotypes, from _ 
tundra-pools at Ooglaamie (Point Barrow), Alaska. July 24, 1882. J. Mur- 
doch coll. 2 specimens (male, female with eggs), cotypes, from tundra-pools at 
Cape Smyth (Point Barrow), Alaska. July 10, 1883. J. Murdoch coll. 3. 
specimens (one male, 2 females with eggs), from tundra pools at Cape Smyth — 
(Point Barrow), Alaska. July 16, 1883. J. Murdoch coll. a 
As to their habits Murdoch states, that ‘they swim swiftly and are very 
hard to catch,” but from my observations of a great many fairy-shrimps of 
different species, including this one, this characteristic is only relative, depending _ 
upon the season, age and sex. While the younger stages and the males, and — 
both sexes at the end of the season are fairly easy to catch, are the full grown 
females in high summer very swift and agile and somewhat difficult to catch. 
This holds good for all the fairy-shrimps I have observed. 
The farthest eastward this species (P. hazeni) has hitherto been observed 
are represented by those collected by J. M. Jessup on the coastal tundra right. 
on the boundary line between Alaska and Yukon Territory (about lat. 694° N., 
long 141° W.). They have been recorded by Pearse (1913), and were collected. 
in a muskeg lake at lat. 69° 40’ N., on July 25, 1912 (where they occurred 
together with Branchinecta paludosa) and in muskeg pools on flood plain of 
Firth River (lat. 69° 20’ N.) on June 23, 1912. The latter date is interesting 
being so very early in the summer; but it must be recalled the locality is’ 
about two degrees of latitude south of Point Barrow. — 
There is little likelihood of this species occurring along the arctic coast east. 
of the Mackenzie delta, otherwise I think it would have been observed during 
the Canadian Arctic Expedition, considering that a number of the two other” — 
American Arctic Phyllopods (Lepidurus arcticus and Branchinecta paludosa). 
were secured along that part of the coast. The new records of P. hazeni from 
Teller, Alaska, probably represent almost its southern limit, so that the species 
must be termed a typical representative of the arctic fauna in Alaska, perhaps 
very similar to the freshwater Amphipod Synurella johanseni (see Part E., 
p. 21, in this volume). Daday (1910) has already called attention to this strictly 
limited (high arctic) occurrence of P. hazeni, and opines that it will not be 
found much south of the isotherm of 14° C., a proposition which the later records 
towards the south and east have now, however, modified somewhat. But they — 
do support Daday’s opinion, that Polyartem. hazeni is the most typical American 
Arctic Phyllopod known so far, replacing Polyartemia forcipata upon this contin- 
ent, though its distribution seems to be far more limited than is the case wit 
P. forcipata. 
¥ 

The specimens examined and described by Ekman (1902) are in the zoological institution, Uppsala, 
Sweden, and comprise six males and fourteen females. Only half of them are in a fair condition, and the 
collecting data are only given as: ‘‘Point Barrow, Alaska. Internat. ‘‘Polar Expedition 1882-84. J. Mur- 
doch.”’ Except for the first branch of the male claspers being more in the shape of ‘accessory claspers’’ 
these specimens agree with Ekman’s description and figures. There are also two males and four females _ 
of this species, collected at Cape Smyth (Point Barrow), Alaska, in 1883, by the same expedition, in British 
Museum of Natural History, London (Norman Collection). 
