160 U.S. NATIONAL MUSEUM BULLETIN 236 



The shape of leg 5 can best be appreciated from figure 57c; there are 

 3 setae on the baso-endopodite, a fine seta on the external lobe and 

 6 setae dispersed along the free border of the exopodite. It must 

 be borne in mind that the 5th legs are strongly concave structures 

 surrounding the eggs. These eggs are small; at least 50 are present 

 in the pouch. 



Color of preserved animal greenish, no eye visible. The whole 

 integument is covered by short hairs, slightly increasing in length 

 on the 5th legs, with the result that these appear as definitely hhsute. 

 On the sides of the abdominal somites there are polygonal fields 

 representing muscular insertions or glands. Genital flap a broad 

 plate, on each side with 4 minute hairs. 



Adult male, total length 0.83 mm.; greatest diameter 0.21 mm.; 

 length of longest furcal seta 0.56 mm. 



General shape of body as in female, with the result that complete 

 description is superfluous (figs. 566, 57a). Principal points of differ- 

 ence are: 



1. Length of male inferior to that of female; proportion of cepha- 

 lothorax and abdomen is 6:5. Abdominal somites 1 and 2 separate. 

 Thickened part of cephalic somite behind rostrum better developed 

 than in female. 



2. Ornamentation of the body as in female; genital flaps (leg 6) 

 with 3 strong setae, very conspicuous in lateral aspect. 



3. Antennules of male 6-segmented, but segment 4 composed of 2 

 fused segments with distinct line of fusion. There is an aesthetasc on 

 segment 3 and one on segment 4. Setation represented in figure 

 56c^; some of smaller setae may have been overlooked. 



4. No differences occur in structure of antenna, oral parts, and legs 

 1, 3, and 4. Endopodite of leg 2 modified, 2-segmented (fig. 59e). 

 Segment 1 normally developed, with 1 internal seta. 2nd endopodal 

 segment only slightly longer than 1st, with 4 setae at the internal 

 margin, increasing in size distally. At apical portion of segment there 

 are 3 spines; internal spine with broad base, rapidly tapering into fine 

 point. Median spine strongly chitinized, curved. External spine 

 strong and straight, reaching slightly beyond end of exopodite, apex 

 pointed, not bifid. 5th legs completely different from those of female 

 (fig. 58g). Baso-endopodite and exopodite of same length, fused. 3 

 spines at baso-endopodite and 6 at exopodite. Shape and position can 

 best be judged from figure 58^. 



Remarks. — 'The present specimens are in complete conformity with 

 A. Scott's and Sewell's descriptions except for the fact that the polyg- 

 onal fields on the abdominal somites and the legs of the female are not 

 mentioned by these authors. In Sewell's male specimen the apex of 

 the median endopodal spine of leg 2 is bifid. 



