Alaskan Records of Burytemora — -Wilson 
hairs. Longest of caudal setae equaling length 
of rami. 
Antennules 24-segmented, reaching to near 
end of metasome segment 5 . Division be- 
tween segments 8 and 9 distinct on inner side, 
but not always on outer. Aesthetes with stalk- 
like bases (Fig. 2 ). Setae not long, none 
reaching farther than to near end of succeed- 
ing two segments. Numerical setation as fol- 
lows (s— 
■seta, sp—spine. 
a— aesthete) : 
Segment 
1—35, a 
13~2s 
2— 3s, a 
14— 2s, a 
3-2s, a 
15— 2s 
4— Is 
16— 2s, a 
5— 2s, a 
17— 2s 
6— Is 
18— 2s 
7— 2s, a 
19-2S, a 
8— sp 
20— Is 
9— 2s, a 
21— Is 
10— sp 
22 — Is 4“ Is 
11— 2s, a 
23— Is+ls, a 
12— Is, a, sp 
24— 6s, a 
Mandible blade (Fig. 5) with anterior side 
rounded, produced to moderately sized den- 
ticle with small transparent cap; symmetrical, 
moderately deep gap present between it and 
following denticle. 
Leg 5 (Fig. 2) having basipod and exopod 
subequal in length. Lateral spines of exopod 
1 short, not as long as width of segment, tips 
sinuous. Inner process nearly straight, form- 
ing right angle with segment, its width greater 
than length of segment (22:15, measured 
from notch at inner lower base); margins 
serrate. Terminal inner spine of exopod 2 as 
long as total exopod, proportion to outer 
lateral spine 25:7; segment produced to min- 
ute point between the two spines ; inner mar- 
gin of segment with two extremely fine hairs. 
Male: Total length dorsal mid-line 1.38 
mm. (metasome 0.81, urosome 0.57 mm.). 
First segment with cephalic depression and 
prominent medial dorsal protuberance as in 
female. 
Urosome 41 per cent of total length of 
body. All segments lacking ornamentation. 
Caudal rami a little shorter than segments 3-5 
505 
Fig. 1. Eurytemora yukonensis n. sp. Female. Meta- 
somal segment 6 and urosome, dorsal view; b, genital 
segment with operculum, ventral view; c, habitus, lat- 
eral view of cephalic segment; <7, habitus, dorsal view. 
combined, about 35 per cent of total length 
of urosome; their length about 7 X their 
width. Rami unornamented, except for long 
hairs on inner margins. Longest caudal setae 
longer than rami. 
Antennules reaching a little beyond meta- 
some. The left differing from that of female 
in having only 1 seta on segment 11, and in 
having aesthetes on all of segments 1-19, 
except on 4. Aesthetes longer than in female, 
those of segments 12 and 14 particularly long, 
reaching to about end of following two seg- 
ments. Right antennule with spines on seg- 
ments 8-12, length of all less than width of 
