No. 8656 COPEPODS—-LEWIS 73 
Free fourth pedigerous segment distinct from cephalothorax, 
indistinctly separable from genital segment; segment widest medially, 
at junction with fourth thoracic legs, tapered anteriorly and poster- 
iorly. Genital segment (fig. 29b) subovoid, posterior region irregular 
in single available specimen. Fifth legs (fig. 30g) situated on posterior 
lateral surface of segment, consisting of node bearing 2 or 3 plumose 
setules (2 present on specimen, indication of additional broken setule) 
and nodule bearing single plumose setule (= sixth leg of Shiino, 
1960, p. 485). 
Abdomen indistinctly 2-segmented, distinct from genital segment 
ventrally, indistinctly separable dorsally. First segment with flatly 
convex lateral surfaces, second tapered slightly to posterior surface. 
Division between segments consisting of break in cuticle of lateral 
regions only, muscle-segment associations not distinct enough to 
indicate segmentation. Caudal rami subpalmate, bearing 3 plumose 
setae and 1 plumose setule distally, plumose seta and setule present 
on distal half of outer lateral surface; distal half of inner surface 
plumose. 
Antennule (fig. 29¢) 2-segmented, attached to anterior lateral 
ventral surface of cephalothorax and adjacent surface of frontal 
region. First segment approximately twice the length of second, 
broad proximally, tapered distally; anterior surface sharply angled 
distally. First segment bearing approximately 22 lightly plumose and 
naked setae and setules. Second segment rodlike, bearing single naked 
setule from distal half of posterior surface, 11 naked setae and setules 
(including 1 bifurcate seta) distally. Antenna (fig. 29f) 3-segmented, 
situated posterior and slightly medial to antennule base. First segment 
squat, subtriangular from ventral viewpoint; second segment well 
developed, broad proximally, tapered slightly to distal end. Third 
segment and terminal process fused, with falciform outline; single, 
setule-like accessory process present on node at proximal end of fused 
segment and terminal process. 
Mandible (fig. 29f) rodlike, 4-parted, distalmost part curved inward, 
flattened, inner surface with 12 denticulations. Postantennal process 
(fig. 29f) situated lateral and slightly posterior to antenna base, con- 
sisting of spikelike projection and 3 nodules bearing several hairlike 
processes. Projection arising from small, subtriangular, heavily 
sclerotized plate, plate also bearing 2 of 3 nodules, third nodule immedi- 
ately posterior to plate. Postoral process (fig 29f) spinelike, curving out- 
ward slightly. Maxillule (fig. 297) nodular, situated immediately anteri- 
or to postoral process, nodule bearing 1 long, 2 short, naked seta-like 
processes. Maxilla (fig. 29g) 2-segmented, situated immediately 
posterior and slightly lateral to postoral process. First segment ap- 
proximately nine-tenths the length of second, second elongate, with 
