106 PROCEEDINGS OF THE NATIONAL MUSEUM tol. lis 



damaged although appearing similar to those of female except for 

 greater plumosity of inner margin. 



Female antennule (fig. 21a) 2-segmented, attached to lateral anterior 

 ventral ceplialothoracic surface at junction of lateral cephalothoracic 

 margin and frontal region. First segment approximately two and one- 

 half times the length of second, broader proximally than distally, 

 with approximately 18 naked or finely plumose setides along edge of 

 ridge extending along anterior and distal portions of ventral surface 

 and terminating in small, subtriangular projection of distal posterior 

 surface. Second segment club-shaped, with 2 naked terminal setules. 

 Antennule of male (fig. 216) with first segment slightly more than twice 

 the length of second, bearing approximately 14 setules, distal 7 densely 

 plumose; second segment with 1 short and 4 elongate, naked setules. 

 Female antenna (fig. 21c) 3-segmented, first and second segments 

 short, strongly developed, first with small adhesion pad; third segment 

 and fused terminal process clawlike, terminal process strongly curved, 

 segment with 2 setule-like accessory processes. Antenna of male 

 (fig. 2lg) 3-segmented, first segment without adhesion pad, second 

 segment slightly shorter than first, with distinct adhesion surface on 

 anterior distal surface, third segment and terminal process complex, 

 segment short, distinct from terminal process, with small adhesion 

 pad, terminal process short, clawlike. 



Female and male mandible (figs. 2ld, e) appearing 2-parted, rod- 

 like, first part short, second part elongate, distal region of second 

 part slightly flattened, rounded distally, inner margin with 12 dentic- 

 ulations. Female and male postantennular adhesion pad (fig. 21a) 

 2-parted, consisting of small, cup-shaped structure situated just 

 posterior and lateral to antennule base, and just anterior to large, 

 ovoid adhesion pad extending posteriorly and shghtly medial. Post- 

 oral process of female (figs. 21c, /) appearing 4-segmented, proximal 

 segment attached to rib-shaped region of heavy sclerotization con- 

 nected to Y-shaped region siurounding mouth and extending anteri- 

 orly, rib-shaped region also forming attachment and articulation 

 surface for mandible. Proximal segment of postoral process strongly 

 developed, with at least 1 plumosity-bearing nodule (Shiino, 1954c, 

 and others report 2 nodules) ; second and third segments elongate, 

 subrectangular, fourth segment lamellate and folded and may be 

 terminal process of third segment. Postoral process of male (fig. 

 21(7) 3-segmented although third segment with irregularity attached 

 to distal end that may be remains of fourth segment or terminal 

 process. Female and male with pair of oval adhesion pads just 

 posterior to mouth cone base (figs. 21^^, h), situated on extensive 

 region of heavy sclerotization forming articulation and muscle at- 



