

104 Canadian Arctic Bapeditien, 913-1918 
Suborder ANOSTRACA. 0 
FAMILY POLYARTEMIIDAE Simon. 
Genus Polyartemiella Daday de Dées. 
Polyartemiella hazeni (Murdoch). by : 
Polyartemia hazeni Murvocn, 1884, p. 522; 1885, p. 150, pl. Il; Exman, 1902,p. 
5, figs. 1-5. a 
Polyartemiella hansent Dapay DE Dé&ss., 1910, p. 106, fig. 2; Pears, 1913, p. 2; 
1918, p. 666. 
Polyartemiella hazent JOHANSEN, 1921 p. 25. (“‘Can. Field-Nat.’’). 
This species was first described and named by the collector, John Murdoch. 
Ekman and Daday de Dees later amplified Murdoch’s description, giving some 
far better figures of both sexes but Daday apparently misread the specific nam 
as hansent, a mistake later followed by Pearse. 
While the southern party of the Canadian Arctic Expedition stayed at 
Teller (Port Clarence), near Bering strait, Alaska, in 1913, I found specimens 
of both sexes of this species in two different tundra-ponds here. 
Two males were secured in the brackish pond, between the large lagoon _ 
lake and Port Clarence bay, on August 3, 1913. Aha 
I give here (text figure 2) an outline of the head and tail-ends (dorsal and — 
ventral views) of one of these males. The total length (from tip of A2 to end 
of cercopods) is 12 mm., A2 being 3 mm. and tail 2 mm. long including the short 
(; mm.) cercopods. Murdoch states, that with his specimens the body (probably 
exclusive of A2) is double the length of the abdomen (tail); but from an examin- 
ation of my specimens this applies more to the female (see below) than to the male 
where its body length is three or four times that of the abdomen. The colour - 
of the living animal is, according to Murdoch, a pale iridescent green; in addition _ 
to this I find, however, that the accessory claspers (see below), the mouth 
parts and the protruding genitalia are more brownish (cuticula), and the contents 
of the intestine dark green, as also the paired eyes have a brilliant purplish- 
black colour, bordered with red. The number of foliaceous legs are 18, while 
the females from August 6, 1913, have only 17 pairs, a sexual difference already 
noted by Murdoch. : 
As seen on text figure 2c the front-end of the head runs out anteriorly into 
a broad, coniform and thorny “lamellar process’? behind which the small, 
black nauplius-eye is situated. The first pair of antennae are more obscure, — 
being more or less hidden by the enormously developed second pair of antennae __ 
(A2). The latter are, with my two males much swollen and antler-like, being — 
divided into three branches, of which the lower one is the longest (and biggest) 4 
with three joints; the next shorter and with two joints; and the terminal one a jk 
stubby, single joint. The whole of the inner (under) side of these claspers (A2), 
from their base to the tips of the branches is covered with small spines, particu- 
larly extensive on the middle part of the clasper. At the base of each clasper is 
inserted, ventrally, a much shorter, truncate appendage tapering off at the free 
end, and also with small spine-hooks on the inner side, from the base to the 
terminal point. I propose to call these the “accessory claspers.”’ They are only 
about one-third the lengths of the large claspers (A2), but distinctly set off from 
ae comparison of the description and figures of P. hazeni, from Teller, Alaska, given in this report, 
with Murdoch’s and Ekman’s (the latter copied by Daday, 1910) descriptions and figures, shows certain — 
differences in the male claspers and in the genital region of both sexes. Prof. A.S. Pearse, of Madison, — 
eas dee prononnces the specimens from Teller, sent to him for examination, to be P. hanseni, 
- hazent rdoch. 
*Daday’s ‘‘appendage."’ 

