360 
PACIFIC SCIENCE, Vol. XIV, October I960 
setae. Each of 2 basal segments produced at 
distal lateral corner as spinous cuticular process. 
Spines of terminal segment subtended by such 
processes, but these much less developed than 
those of basal segments. Each segment with 
dense row of cilia on lateral margin. Spines of 
terminal segment with hyaline flanges. All setae 
of leg with plumose ciliation. 
Third legs (Fig. 74) with well-developed 
bimerous protopodites yoked by substantial in- 
tercoxal plate. Medial seta of coxopodite, slightly 
longer than width of plate, inserted on medial 
free portion of distal border of segment. A few 
spinules at distal lateral corner of coxopodite. 
Basipodite with lateral seta; terminal margin 
with rows of cilia. Exopodite, extended directly, 
without notable 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 
spinules on lateral margin, cilia on medial mar- 
gin. Proximal 5 spines of ramus each outlined 
with serrate, hyaline flange. Apical spine with 
external hyaline flange and internal row of cilia. 
Trimerous endopodite flexed medially and prox- 
imally. Armature: first segment, 1 medial seta; 
second segment, 2 medial setae; third segment, 
3 lateral spines, set in steplike emarginations, 
1 terminal spine, 2 medial setae. Each of 2 
basal segments produced at distal lateral corner 
as moderately small, spinous cuticular process. 
Spines of terminal segment subtended by such 
processes, but these less developed than those of 
basal segments. Each segment with dense row 
of cilia on lateral margin. Spines of terminal 
segment with hyaline flanges. All setae of leg 
with plumose ciliation. 
Fourth legs (Fig. 75) with well-developed 
bimerous protopodites yoked by substantial in- 
tercoxal plate. Medial seta of coxopodite very 
small, inserted on somewhat diagonally directed 
medial free portion of distal border of segment. 
A few spinules at distal lateral corner of coxo- 
podite. Basipodite with small lateral seta, medial 
margin with row of cilia. Exopodite, extended 
directly, without notable flexure, trimerous. 
Armature: first segment, 1 lateral spine; second 
segment, 1 lateral spine, 1 medial seta; third seg- 
ment, 2 lateral spines, 1 terminal spine, 1 ter- 
minal seta, 4 medial setae. First segment with 
row of spinules on lateral margin, cilia on medial 
margin. Proximal 4 spines of ramus each out- 
lined with serrate, hyaline flange. Apical spine 
with external hyaline flange and internal row of 
cilia. Trimerous endopodite with very slight 
flexure. Armature: first segment, 1 medial seta; 
second segment, 2 medial setae; third segment, 
3 lateral spines set in steplike emarginations, 1 
terminal spine, 1 medial seta. Each of basal 2 
segments produced moderately at distal lateral 
corner as small spinous cuticular process. Each 
spine of terminal segment subtended by such 
process, these less well developed than those of 
basal segments. All segments with dense rows 
of cilia on lateral margins. Spines of terminal 
segment with hyaline flanges. All setae of leg 
with plumose ciliation. 
Fifth legs (Fig. 69) with probably 2 seg- 
ments represented, basal consisting only of ex- 
pansion on body posteriorly and laterally on 
segment of legs to furnish articulation of distal 
segment, but with 1 small seta representing 
armature. Second segment elongate, flattened, 
with cuticularized medial and lateral margins. 
Shape highly distinctive, basal fourth much con- 
stricted, with abrupt flare to level of first spine. 
Length about 3.2 times greatest width. Arma- 
ture 3 spines and 1 seta, about equally spaced 
on lateral and terminal margins: 1 lateral spine 
at about distal .7 of lateral margin, 1 lateral 
spine at about distal .8 of margin; 1 seta at 
lateral distal corner; apical spine at medial dis- 
tal comer. Spines subtended by small groups of 
spinules. Short row of spinules on distal fourth 
of medial margin. 
Sixth legs probably represented by small se- 
rif erous knob (Fig. 61) in depression at aper- 
ture of oviduct, located dorsally on lateral 
expansion of genital segment. One small setule 
forming armature. 
Caudal ramus (Fig. 70) about 3 times as long 
Figs. 71—79: Anthessius nortoni, new species. The scales accompanying certain figures represent 0.1 mm. 
Female: 71, antennule; 72, first leg; 73, second leg; 74, third leg; 75, fourth leg. Male: 76, first leg; 77, sec- 
ond leg; 78, third leg; 79, fourth leg. 
