206 PROCEEDINGS OF THE NATIONAL MUSEUM vol. ii5 



leg-bearing segment of thorax, contained in cephalothorax, extended 

 over fourth thoracic leg-bearing segment. Fourth thoracic leg- 

 bearing segment partially visible dorsally, separated from genital 

 segment by distinct line of division; fourth thoracic leg-bearing seg- 

 ment and genital segment not covered by single, dorsal plate as in 

 female. Fifth legs visible as conical projections of lateral margins of 

 genital segment, projections appearing as series of three overlapping, 

 lappet-like processes, each bearing single, terminal, plumose seta. 

 Sixth legs visible as conical projections of posterior lateral margins of 

 genital segment, lappet-like processes visible on fifth legs also present 

 on sixth though not as distinct; sixth legs with three terminal, plu- 

 mose setules (figs. 17b,e). 



Antennule of male and female two-segmented, excluding frontal 

 plate, attached to ventral surface of both cephalothorax and frontal 

 region just medial to lateral margins of frontal region. First seg- 

 ment broad proximally, tapered on anterior margin to narrow distal 

 end; greatest length one and one-fourth times greatest width. An- 

 terior margin of first segment with fifteeen plumose setae. Second 

 segment slightly more than half length of first, with naked seta on 

 middle of posterior margin and 13 naked setae from rounded distal 

 end (fig. 17/). 



Second antenna of holotype female three-segmented, attached 

 posterior and medial to antennule base. First segment short, broad, 

 forming articular surface for second segment; with triangular, pos- 

 teriorly directed process. Second segment well developed, greatest 

 width equal to greatest length, with small adhesion pad on inner distal 

 surface. Second segment with several small, heavily chitinized de- 

 pressions on distal margin serving as articular surfaces for third seg- 

 ment. Third segment with terminal, clawlike process; division 

 between segment and process indistinct. Terminal process curved 

 sharply inwards distally. Length of third segment and terminal 

 process greater than that of second segment; third segment without 

 accessory processes (fig. 17^). 



Second antenna of allotype male three-segmented; first segment 

 long, narrow proximally, expanded medially, tapered distally; distal 

 end with projecting, lobate articular process, without posteriorly 

 projecting process of female. First segment with adhesion surface on 

 outer distal half of segment. Second segment strongly developed, 

 swollen proximally, narrow distally. Inner surface of second seg- 

 ment forming adhesion surface proximally; with small, swollen ad- 

 hesion surface projecting from inner distal surface; both adhesion sur- 

 faces on inner surface connected by irregular ridges. Third segment 

 short, with compound terminal process consisting of simple, curved, 

 spinelike structure with bifurcate process fused to anterior lateral 



