40 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 125 
segment articulating on platelike process extending posteriorly from 
frontal region, terminating in cephalothorax posterior to frontal 
region. Anterior ventral and anterior lateral surfaces of first segment 
bearing 24 plumose setae and setules, bifurcate process (fig. 170) 
present on posterior edge of distal surface. Second segment elongate, 
bearing single naked seta from middle of posterior surface, 12 naked 
setae from distal surface. Female antenna (fig. 17c) 3-segmented, 
situated posterior and medial to antennule base. First segment broad, 
irregular, bearing spikelike projection on inner posterior surface. 
Second segment short, well developed. Third segment and terminal 
process indistinctly separable or continuous, clawlike, seta-like 
accessory process present at indistinct junction of segment and ter- 
minal process. Male antenna (fig. 17d) 3-segmented, positioned as in 
female. First segment elongate, with large adhesion surface ventrally; 
length of second segment approximately the same as first, segment 
well developed, with several irregular, spikelike projections and 2 
adhesion surfaces, one on anterior medial region, second on broad, 
irrezular projection of inner medial region. Third segment distinct 
from bifurcate terminal process, bearing single seta-like accessory 
process on inner surface, at junction of segment and terminal process. 
Mandible of female and male (fig. 17e) 4-parted, rodlike, distalmost 
part curved inward, flattened, bearing 11-12 denticulations. Female 
and male postantennal process (fig. 17f) situated lateral and slightly 
posterior to antenna base, consisting of spikelike projection and 3 
nodules, each bearing several hairlike processes. Two nodules present 
on base of spikelike projection, third situated immediately posterior 
to base. Female postoral process (fig. 17g) consisting of bifurcate 
projection immediately posterior to maxillule, male process (fig. 17h) 
spikeshaped, with poorly sclerotized accessory spine from distal half 
of inner ventral surface. Female and male maxillule (figs. 179,h) 
consisting of nodule bearing 3 seta-like processes. Female and male 
maxilla (fig. 177) 2-seemented, situated lateral and slightly posterior 
to postoral process. Both segments elongate, first approximately 
four-fifths the length of second. Rodlike second segment with 2 
membranes on medial inner surface (one folded, appearing spinelike) 
and 2 saber-like terminal processes, innermost slightly more than 
twice the length of outer, with frilled membrane along both margins, 
outermost process with frilled membrane on outer margin only. 
Male with lobate postoral adhesion surface (fig. 17h), surface similar 
to adhesion surface on first segment of antenna although plates not as 
distinct. 
Maxilliped of female and male (fig. 177) 2-segmented, situated pos- 
terior and medial to maxilla base. First segment strongly developed, 
length slightly more than one and one-half times that of combined 
