COPEPODA FROM IFALUK ATOLL 293 



Furcal rami about 1% times as long as basally broad (length 35m, 

 diameter at base 21^). I could find only 3 marginal setae and 1 ap- 

 pendicular seta on each ramus, but this reduced setal condition maj^ 

 be the results of damage. One of the apical setae is greatly thickened 

 and reaches % body length. Two remaining setae fine, inserting 

 along external margin. Appendicular seta fine, inserting at base of 

 fairly conspicuous apoph^^sis, particularly visible in lateral aspect of 

 furca. Furcal rami conical, slightly tapering, internal border set 

 with 6-7 small spines. 



Antennules short, about as long as cephalic somite, subchirocerate, 

 6-segmented. 2nd segment with big, acutely pointed, externally 

 directed spine. 4th segment greatly swollen, with sensory seta in 

 addition to smaller setae. 



Antenna with unsegmented exopodite, carrying 3 setae. Oral 

 appendages as in Orthopsyllus linearis; not studied in detail. 



Leg 1 (fig. 1 Hg) with internal and external seta on basis. Exopodite 

 3-segmented, endopodite 2-segmented. 1st and 2nd exopodal seg- 

 ments without internal setae; 3rd exopodal segment with 4 setae. 

 1st endopodal segment nearly as long as whole exopodite, without 

 internal seta. 2nd endopodal segment small, with 2 setae. 2 of 

 exopodal setae and 2 endopodal setae provided with apical brush of 

 hairs. 



Leg 2 (fig. 114/) with small external spiniform seta on basis. 

 Exopodite 3-segmented, endopodite 2-segmented. 1st and 2nd 

 exopodal and 1st endopodal segment without internal setae. 3rd 

 exopodal segment with 3 external marginal spines and apical spine; 

 2nd endopodal segment with 3 setae. 



Leg 3 (figs. 114^7-?') with 3-segmented exopodites and endopodites. 

 Exopodite as in leg 2; 1st endopodal segment small, without setae. 

 2nd endopodal segment drawn out in long apophysis, apex of which 

 has a spirally curved carina. 3rd endopodal segment small, with 

 fine internal seta and 2 apical setae, one of which is greatly lengthened 

 (fig. 114i). 



Leg 4 (fig. 114^) with 2-segmented endopodite; exopodite 

 3-segmented and as in legs 2 and 3. 1st endopodal segment minute, 

 without setae; 2nd endopodal segment with 3 setae. 



Exopodites of legs 2 to 4 strongly spinulose along external margin. 



Leg 5 (fig. 114^) small, especially baso-endopodite, which carries 

 strong internal spine and fine external seta. Exopodite well separated 

 from baso-endopodite, about as long as greatest diameter, with total 

 of 5 appendages: 4 small and spiniform, 1 a strongly developed, apical 

 spine. External lobe distinct, with small seta. Leg 6 (genital 



