Alaskan Records of Eurytemora — Wilson 
Dorsal surface of segments 2 and 3 spinul- 
ose except in medial portion. 
Caudal rami subequal in length to segments 
2 and 3 combined; length about 6 X their 
width (measured without pressure) ; their dor- 
sal surface entirely covered with short, stiff 
hairs extending over outer margin to base oj 
lateral seta; inner margin with closely set long 
hairs. Inner terminal seta longest, equaling 
length of ramus. 
Antennules shorter than metasome, reach- 
ing to about middle of fifth somite; 24- 
segmented, segments 8 and 9 imperfectly 
separated, Setation typical as in female of 
yukonensis, aesthetes on narrow basal stalks. 
Setae comparatively long, particularly on seg- 
ments 7-20; those of 15 and 20 longest, those 
of 15 of nearly uniform length, reaching to 
near end of or beyond segment 18. 
Mandible blade (Fig. 5 ) having anterior 
edge produced to a large triangular tooth, 
usual gap between it and succeeding denticle 
filled by a rounded protuberance. 
Leg 5 (Fig. id) having exopod (exclusive 
of spines) only a little longer than basipod, 
25:20. Spines of exopod 1 longer than width 
of proximal part of segment. Lateral spine of 
exopod 2 nearly as long as terminal inner 
spine. Relative lengths of spines to one an- 
other: 
Segment 1 Segment 2 
9 : 11 13 : 18 
Exopod 1 not quite twice length of exopod 
2 (16:9)- Inner process, measured from inner 
base of segment 2, a little longer than total 
length of its segment (19:16); tips markedly 
upcurved, margins with a few exceedingly 
fine serrations. Lateral spines appearing un- 
armed except under high power which shows 
that their margins are also minutely serrate. 
Terminal inner spine of exopod 2 relatively 
short, about twice length of segment which 
is not produced to a spinous point between 
it and lateral spine. Two very fine hair-like 
setae on inner margin of segment. 
Male: Total length dorsal mid-line about 
1.07 mm. (metasome 0.605, urosome 0.465 
509 
Fig. 6. Eurytemora composita Keiser. Female, a, Meta- 
somal segment 6 and urosome, dorsal view; b, oper- 
culum and lateral outline of genital segment, ventral 
view; c, habitus, lateral view; d, outline of metasomal 
wings and genital operculum, lateral view. 
mm.). Cephalic segment in lateral view show- 
ing no depression or distal protuberance. Last 
segment not produced laterally, armed with 
a few hairs. 
Urosome (Fig. 7) 43 per cent of total length 
of body. Segments 1-4 armed laterally with 
scattered hairs, segment 5 with short spinu- 
lose hairs on outer dorsal surface and lateral 
margins. 
Caudal rami (exclusive of setae) a little 
longer than segments 3-5 combined; equaling 
about 39 per cent of total length of urosome; 
their length nearly 10 X their greatest width. 
Outer margin with closely set coarse hairs 
which may or may not extend onto dorsal 
