Alaskan Records of Eurytemora — Wilson 
507 
Fig, 3. Eurytemora yukonensis n. sp. Male, a, Leg 5, posterior view; b, leg 5, detail of apex of left exopod, pos- 
terior view; c, left antennule, segments 11-13, with detail of aesthetes; d, right antennule, apical segments; 
e, right antennule, segments 8-12, with detail of spines;/, urosome, dorsal view. 
Mandible blade with symmetrical gap be- 
tween anterior edge and succeeding denticle. 
Spines on segments 8-12 of right antennule 
of male shorter than width of segments, those 
of 9 and 12 longest. 
Leg 5 of female with 2 spines on exopod 
1; inner process straight, wider than length 
of segment; lateral spines short. Inner ter- 
minal spine of exopod 2 as long as whole 
exopod; this segment with inner hairs. 
Leg 5 of male with both rami 4-segmented, 
claw of right side very much longer than pre- 
ceding segment (73:50). Terminal portion of 
left leg expanded but without digitiform' 
protrusion. 
COMPARISON WITH OTHER SPECIES 
The fifth leg of the female most closely re- 
sembles that of Eurytemora lacustris Poppe (as 
described by Sars, 1903) . It further agrees with 
this species in lacking dorsal ornamentation 
on the urosome and caudal rami. It differs in 
having the last metasomal segment produced 
into conspicuous wings and the genital seg- 
ment swollen and constricted laterally. The 
left fifth leg of the male of yukonensis differs 
from lacustris in not having the terminal por- 
tion produced into a prominent digit. 
Eurytemora composita Keiser 
Figs. 5-7 
Eurytemora composita Keiser, 1929: 301, figs. 
1 - 6 . 
Eurytemora composita Smirnov, 1929: 318, figs. 
1 - 2 . 
Eurytemora composita Rylov, 1930: 234, fig. 
77 (after Keiser). 
