352 
PACIFIC SCIENCE, Vol. XIV, October I960 
tinctive structures marking apertures of oviducts 
and sites of attachment of egg sacks (Fig. 38). 
Egg sack (Fig. 29) about .35 of total body 
length, containing several hundred small eggs. 
Antennule (Fig. 31) essentially 7-segmented, 
but with complicated articulation and integu- 
mental modification between second and third 
segments, so as to suggest either coalescence or 
incipient separation of an additional minute 
segment. Approximate proportional lengths of 
segments, basal to distal: Segment I, 3; II, 7; 
III, 1.5; IV, 5; V, 3.5; VI, 1; VII, 1. Setae, vary- 
ing in length and count per segment: Segment 
I, 4 setae; II, 7 setae near base of segment, 8 
around distal end; III, 5 setae, 1 belonging to 
section suggesting a free segment; IV, 3 setae; 
V, 4 setae, 1 aesthete; VI, 2 setae, 1 aesthete; 
VII, about 5 setae, 3 on basal prominence of 
segment, apparently 2 setae and 1 aesthete apical. 
Antenna (Fig. 32) with segmental composi- 
tion obscured by flexures, involving integu- 
mental folds, and torsions, probably 3 -segmented. 
Basal segment with partial distal articulation, 
1 short external seta apically. Second segment 
with very complicated distal articulation, 1 short 
seta distally and externally inserted. Terminal 
segment short, with cuticularized ridges and 
folds and with very broad distal margin furnish- 
ing insertion for 4 elaborately articulated claw- 
like elements and 2 large setae. Another larger 
seta inserted midway between group of claws 
and apical setae. Small seta at external distal 
corner. A subapical group of 4 small setae of 
diverse lengths. Total elements: 4 claws, 8 setae. 
Mouthparts compactly and intricately arranged 
in oral area (Fig. 33). Labrum of 2 conspicuous 
lobes, overlying entirely blades of mandibles, 
and much of distal parts of maxillae. 
Mandible (Fig. 34) a flat, unsegmented plate, 
with cuticularized anterior and posterior mar- 
gins. Appendage terminating in long lashlike 
blade with complicated marginal ornamentation. 
Two most basal elements of ornamentation flat 
platelike structures, compound apically and ar- 
ticulating with margin of appendage. Remainder 
of ornamentation a long row of graduated den- 
ticles, about 15 of them of conspicuous size. On 
anterior margin articulated a long lashlike auxil- 
iary seta with conspicuous marginal ornamen- 
tation. All of outer margin bearing graduated 
row of spinules, distal two-thirds of inner mar- 
gin with short spinules. Between apical lash and 
auxiliary seta a small articulated cuticular piece, 
subtriangular in outline. 
Maxillule (Fig. 35) of characteristic type for 
the genus, an elongate lobe with flaring apex. On 
apex a spine and far laterally a seta. A medial 
apical indentation setting off a blunt median 
subapical lobe. Margins of appendage much 
sclerotized. Apical spine subtended by cuticular 
spinous processes and spinules. 
Maxilla (Fig. 36) with very long diagonal 
articulation with body surface, resulting in char- 
acteristic basal segment, on which articulates 
flattened apical segment, with heavily cuticu- 
larized margins. Apex produced in sharp angle 
anteriorly with toothlike expansions of cuticle 
forming a medial saw-edge. Four large teeth 
formed by flangelike protrusions of cuticle. Apex 
produced as very small spinelike processes, 1 on 
each side of most distal tooth. Inserted at base 
of angle of curvature of this segment and lying 
on surface, an articulated, short, stout spine. 
Maxilliped (Fig. 37) fairly long, a prominent 
mouthpart, as seen in general habitus of mouth 
area (Fig. 33), but with little development of 
segmentation or ornamentation. Three segments 
suggested by folds and flexures of integument. 
Basal 2 segments not ornamented. Terminal seg- 
ment with 2 apical setules. 
First legs (Fig. 40) with well-developed 
bimerous protopodites, yoked by substantial in- 
tercoxal plate. Basal width of basipodite less 
than width of distal margin of coxopodite, so 
medial seta of coxopodite inserted on free por- 
tion of margin. Small spinules forming orna- 
ment on lateral distal corner of coxopodite. 
Coxopodite seta relatively long, extending me- 
dially, and with its length equal to width of 
intercoxal plate. Basipodite with lateral seta 
proximal to insertion of exopodite and with 
dense row of cilia on curving medial margin. 
Exopodite, extending 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, 3 medial setae. 
First segment with fine spinules on lateral mar- 
gin, dense row of cilia on medial margin. Prox- 
imal 5 spines of ramus each outlined with serrate 
