268 U.S. NATIONAL MUSEUM BULLETIN 236 



oped; endopodite reaches slightly beyond articulation between 2nd 

 and 3rd exopodal segments. 



Exopodite of leg 5 twice as long as broad, ovate; external and 

 internal walls parallel. 6 marginal setae, distribution of which can 

 best be judged from figure 108;. Baso-endopodite short, reaching half 

 length of exopodite, with 5 setae. External lobe small, with fine, 

 nude seta. 



Color transparently greenish, with globular, green granules at 

 several places in the body. There is a pair of cuticular lenses or 

 chitinized thickenings just behind the base of the rostrum that may 

 represent a paired visual organ. 



Adult male (loc. 591), 0.42. mm.;greatest diameter 0.11 mm.;length 

 of longest furcal seta 0.23 mm. 



General shape of body almost as in female, but slenderer, with 

 division between cephalothorax and abdomen distinctly marked; 

 various thoracic and abdominal somites stand out less clearly than in 

 female, because circular constrictions are not present (fig. 105c). 

 Head and 1st thoracic somite fused, cephalic somite as long as com- 

 bined lengths of thoracic somites 2 to 4. Back very little curved, 

 rostrum smaller than in female, % length of 1st antennular segment, 

 shape as in female (fig. 107d). Sides of cephalic somite less produced, 

 with the result that basal parts of oral appendages are distinctly 

 visible. Epimeral plates of thoracic somites 2 to 4 scarcely produced, 

 cut off squarely. 



5th thoracic somite distinctly visible dorsally and laterally, on 

 each side with laterodorsal row of spinules. 1st and 2nd abdominal 

 somites separate, of equal length. 3rd and 4th thoracic somites of 

 equal length, each shorter than 1 or 2. Somites 1 to 4 with completely 

 encircling distal row of spinules, which on 1st somite ventrally inter- 

 rupted by genital plates that are distinctly visible laterally (fig. 107e). 

 Anal somite slightly shorter than 4th somite; anal plate distinct, 

 broadly rounded and fringed with spinules. Insertion of furcal 

 rami also bordered by strong spinules. Furca as in female, develop- 

 ment of setae also identical in sexes. 



Antennules (fig. 109a) about as long as cephalic somite, subchi- 

 rocerate, 8-segmented, hinge developed between 5th and 6th segments. 

 4th segment moderately swollen at its base with patch of short setae; 

 conical process well developed. Apical portion of 4th segment 

 more or less set off from segment 4, giving impression of separate 

 segment, with pectiniform row of hairs. Setation represented in 

 figure 109a. 



2nd antenna and oral appendages as in female, not described in 

 detail here. Legs 1 to 4 as in female, internal spine on 1st endopodal 

 segment of leg 1 stronger and plumose (figs. 109~be). 



