36 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



136) distinct from fourth pedigerous segment, shape irregularly- 

 ovoid. Segment appearing 2-parted dorsally, with indication of 

 break ventrally; anterior fourth of segment (in region of ventrally 

 projecting plates in female) with distinct line of division on lateral 

 dorsal surface. Fifth legs (fig. 13c?) situated on lateral ventral surface 

 in middle of segment, consisting of 2 nodules, anteriormost with 

 single plumose setule, posteriormost with 3 plumose setules. Abdo- 

 men distinct from genital segment, elongate, segmentation more 

 distinct than in female. First segment approximately 53 percent of 

 abdomen length, with pair of large flaps (smaller than those of female 

 although thicker) extending posteriorly to end of second segment. 

 Second segment approximately 27 percent of abdomen length, cylin- 

 drical; third "segment" approximately 20 percent of abdomen length, 

 similar in shape to that of female. Caudal rami as in female. 



Female antennule (fig. 13g) 2-segmented, attached to lateral-ante- 

 rior ventral surface of cephalothorax and posterior-lateral ventral 

 surface of frontal region. First segment slightly more than twice 

 the length of second, with approximately 15 naked or lightly plumose 

 setvdes. Second segment cylindrical, with single naked setule from 

 median dorsal surface, second from median posterior surface, ap- 

 proximately 11 from distal region. Male antennule similar to that of 

 female although sclerotization of first segment irregular, giving 

 pseudosegmented appearance (Shiino's "2 false joints," 1954b, p. 288). 

 Female antenna (fig. 13A) 3-segmented, attached posterior and 

 medial to antennule base. First segment short, irregular, with 

 posteriorly projecting spike from posterior surface. Second segment 

 strongly developed, without any major irregularities. Third segment 

 and terminal process clawlike, segment separable from terminal 

 process only by indistinct break in sclerotization, with setalike acces- 

 sory process from proximal posterior surface, second from distal posterior 

 surface. Male antenna (fig. 13i) similar to that of female except 

 spikelike projection of first segment smaller, third segment distinctly 

 separable from terminal process, terminal process with spikelike 

 projection from proximal posterior surface. 



Female and male mandible (figs. 13^, j) 3-parted, rodlike. First 

 part broad proximally, tapered distally; second part short, slightly 

 less than half the length of first, tapered. Third part elongate, slightly 



Figure 13. — Euryphorus nordmanni Milne-Edwards, 1840; ventral view: a, female free 

 fourth pedigerous segment, genital segment (with projecting plates at anterior end), and 

 anterior end of abdomen; b, male, same; c, female fifth leg; d, male fifth leg; e, anterior 

 end of female genital segment showing projecting plates;/, caudal ramus; g, left anten- 

 nule; h, female oral region, left side showing antenna, postantennal process, mouth cone, 

 mandible (mdbl), maxillule, postoral process, maxilla base (ma-2), and postoral V-shaped 

 ridge; i, male left antenna;;, mandible. 



