370 
PACIFIC SCIENCE, Vol. XIV, October I960 
meat. A few spinules at distal lateral corner of 
coxopodite. Basipodite with lateral seta. Exopo- 
dite with slight flexure, trimerous. Armature': 
first segment, 1 lateral spine; second segment, 
1 lateral spine, 1 medial seta; third segment, 3 
lateral spines, 1 terminal spine, 1 terminal seta, 
4 medial setae. First segment with row of fine 
spinules on lateral margin, cilia on medial mar- 
gin. Proximal 5 spines of ramus each outlined 
with serrate, hyaline flange. Apical spine with 
apical flange and internal row of cilia. Trim- 
erous endopodite with medial flexure. Arma- 
ture: first segment, 1 medial seta; second seg- 
ment, 2 medial setae; third segment, 3 lateral 
spines set in emarginations, 1 terminal spine, 
1 medial seta. Medial setae of all segments re- 
duced, that of distal segment very short. Each 
of basal 2 segments produced moderately at dis- 
tal lateral corner as small spinous cuticular proc- 
ess. Each spine of terminal segment subtended 
by such process, these less well-developed than 
those of basal segment. Each segment with row 
of cilia on lateral margin. Spines of terminal 
segment with hyaline flanges. All setae of leg 
with plumose ciliation. 
Fifth legs (Fig. 108) with probably 2 seg- 
ments represented, basal involved in expansion 
on segment of body posteriorly and laterally to 
furnish articulation for distal segment, with 1 
small seta representing armature. Second seg- 
ment elongate, very -wide, flattened, with cutic- 
ularized medial and lateral margins. Length 
about 2 times greatest width. Armature 3 spines 
and 1 seta, spines about equally spaced on lat- 
eral and terminal margins: 1 lateral spine at 
about distal half of lateral margin, 1 lateral 
spine at about distal .9 of margin; apical spine 
at medial distal corner. Short, slender seta be- 
tween terminal 2 spines, somewhat closer to 
apical spine. Spines subtended by small groups 
of spinules. A row of spinules on proximal third 
of medial margin and a row on most of lateral 
margin. Several short rows of spinules forming 
dense patch at apical medial corner. 
Sixth legs probably represented by setiferous 
curving process (Fig. 109) at aperture of ovi- 
duct, located dorsally on lateral expansion of 
genital segment. Armature 1 relatively well- 
developed seta and 1 short, tapered, stout spin- 
ule. 
Caudal ramus about 4.5 times as long as 
greatest width and about 2 times as long as anal 
segment. Shape most characteristic, a flat lamina 
expanding to greatest width at about proximal 
third, gradually tapering to apex, which is half 
as wide as greatest width. Margins with conspic- 
uous cuticular development. Armature 6 setae 
(Fig. 110). Of apical quartet of setae, medial 
of central 2 longest, about .8 times as long as 
ramus, adjacent seta about .4 times length of 
ramus. Medial apical seta about .16 times as 
long as ramus; lateral apical seta about .16 times 
as long as ramus. Lateral marginal seta short, 
about .7 times as long as ramus, inserted slightly 
proximal to midpoint of lateral margin. Dorsal 
medial seta short, slender, about .1 times length 
of ramus, inserted subapically, at about distal 
.9 of ramus. Length of caudal ramus 1.1 mm. 
( 1.0-1. 1) and greatest width .23 mm. (.20- 
.25), averages for 10 specimens. 
male (Figs. 103, 111-125): Body length 
6.0 mm. (5. 6-6.2), greatest width 2.1 mm. 
( 1. 9-2.3 ), averages from 10 specimens. Body 
shape (Fig. 103) of same distinctive form as 
that of female, slightly larger overall, with 
larger fifth legs and larger caudal rami. Ceph- 
alosome equivalently expanded in outline, with- 
out superficial indication of included segment 
of first legs. Antennules elongated and flattened. 
Cephalosome much the widest body region. Ven- 
trally at apex a bulgelike protrusion (Fig. 117), 
not an actual rostrum. Three segments of meta- 
some each with distinctive expanded lateral 
epimera, as in female. Urosome 6-segmented, 
very characteristic in structure, by enormous 
size of fifth legs, uniquely developed anal seg- 
ment and caudal rami. Segments of legs 5 and 
6 much coalesced in a genital complex contain- 
ing elongate paired spermatophores. Segment 
of leg 5 widest segment of urosome, fifth legs 
borne far laterally and each lying along and 
parallel with margin of next posterior segments. 
Fifth leg reaching to middle of third urosomal 
segment. Segment of leg 6 longest segment of 
urosome, with some lateral expansion, this in- 
volving only very gradual taper from anterior 
margin of segment. Anal segment, as in female, 
with flaring outline, and supporting enormous, 
elongate, flattened caudal rami. 
Antennule (Fig. 118) markedly similar in 
