46 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 125 
to genital opening, consisting of 2 plumose setules. Abdomen distinct 
from genital segment, 2-segmented, first segment approximately 
three-fourths the length of second, both segments subrectangular. 
Caudal rami similar to those of female although small convex projec- 
tion on distal inner surface more distinct in male. 
Female antennule (fig. 19g) 2-segmented, attached to lateral post- 
erior ventral surface of frontal region and adjacent ventral surface of 
cephalothorax. First segment slightly less than twice the length of 
second, broad proximally, tapered toward slightly constricted distal 
end, anterior ventral and anterior surface bearing 24 naked and 
lightly plumose setae and setules. Second segment rodlike, with single 
naked setule from middle of posterior surface, approximately 11 naked 
setules from distal surface. Male antennule similar to that of female 
except second segment longer, first segment only 1.4 times the length 
of second. Female antenna (fig. 200) 3-sezmented, situated posterior 
and medial to antennule base. First segment short, distal surface sub- 
triangular, inner posterior surface with small, spikelike projection. 
Second segment short, slightly wider proximally than distally. Third 
segment continuous with clawlike terminal process, bearing 2 setule- 
like accessory processes, 1 proximally, 1 medially. Male antenna (figs. 
20a,c) 3-segmented, first segment longer than that of female, spikelike 
projection minute. Second segment longer than that of female, with 
one adhesion pad on proximal inner surface, another forming ridgelike 
projection from distal posterior surface. Third segment short, suborbi- 
cular, distinct from short, beakshaped terminal process, bearing 2 
setule-like accessory processes, 1 on either side of terminal process. 
Female and male mandible (figs. 20a,b) rodlike, 4-parted, distalmost 
part flattened, curved inward, inner margin with 12 denticulations. 
Female and male maxillule (figs. 20a,b) palplike, situated posterior and 
slightly lateral to mandible base, with naked terminal setule and seta. 
Female and male maxilla (fig. 20d) 2-segmented, situated posterior and 
lateral to maxillule. First segment slightly less than half the length of 
second, with spikeshaped projection from inner proximal surface; seg- 
ment curved inward slightly toward distal end. Second segment elon- 
gate, with small, membranous, subconical projection from distal half 
of inner surface, distal surface bearing 2 seta-like processes, innermost 
slightly less than twice the length of outermost, with fine membrane 
along inner surface, outer terminal process with fine membrane along 
outer margin. 
Female postantennal process (fig. 200) situated posterior and slightly 
lateral to antenna base, consisting of 3 nodules bearing several hairlike 
processes and short, spikeshaped projection originating from round, 
heavily sclerotized plate. Anterior 2 nodules situated on plate, third 
