208 U.S. NATIONAL MUSEUM BULLETIN 236 



Leg 5 (fig. 77c) with large, almost circular exopodite, bearing 6 

 setae, attached to baso-endopodite by means of very narrow strip. 

 6 marginal setae; size and distribution can best be taken from figure 77c; 

 internal and external borders are spinulose. Baso-endopodite reach- 

 ing halfway along exopodite, with 5 setae and some dispersed spinules. 



Color completely faded, greenish yellow. No eye or eyespot 

 visible. Female carries sac with 5 eggs. 



Adult male (loc. 592), total length 1.02 mm.; greatest diameter 

 0.23 mm.; longest fm-cal seta 0.65 mm. 



Body strongly built and slender (figs. 81a, 6), greatest diameter at 

 end of cephalic somite, very gradually narrowing posteriorly, of same 

 general appearance as female. Rostrum as in female though depres- 

 sion in cephalic somite is not so deep. Separation between cephalo- 

 thorax and abdomen more indistinct than in female, both parts of 

 body of nearly same length (fig. 81a). 1st and 2nd abdominal somites 

 separate; 1st with some dorsolateral spinules; genital plates distinctly 

 visible in lateral aspect, each bearing 3 setae. 2nd abdominal somite 

 with several short rows of spinules, together forming complete zone 

 of spinules on distal part of somite; spinules on 3rd somite more 

 moderately developed. 4th somite with some dorsolateral and ventro- 

 lateral spinules only. Anal somite short, insertion of furcal rami 

 bordered by spinules; anal flap nude (fig. 78c). 



Development of fiu-cal rami and setation as in female, lengthened 

 setae 2 and 3 not swollen at base. 



Antennules 8-segmented, subchirocerate, jointing between 5th and 

 6th segments. Setation represented in figure 80^. In Sars' specimen 

 (1906, pi. 92) the antennule appears to have been 9-segmented by the 

 development of an extra jointing in the 7th segment. There are 2 

 aesthetascs, 1 on segment 3, 1 on cone of segment 4. 



No sexual differences were observed between oral parts and 2nd 

 antennae of male and female. 



Leg 1 (fig. 79e) is almost as in female, but internal spine on basis 

 very big and curved upward, reaching half length of endopodite; 

 spine's base is bordered by spinules. 



Detailsof legs2 to 4 can be taken from figures 79f-h; the setal formula 

 does not differ from that of the female: 



endopodite exopodite 



leg 2 1. (modified) 1.1.223 



leg 3 1.2.321 1.1.323 



leg 4 1.1.221 1.1.323 



Endopodite of leg 2 (fig. 79/) modified; 1st segment with short 

 internal seta and with strong basal spine. 2nd segment with large, 

 external knife-shaped appendage, internal margin with 2 appendages 

 and long, plumose seta. In addition, there are 2 fine setae at the 

 internal margin of the segment. 



