110 U.S. NATIONAL MUSEUM BULLETIN 235 



Leg 1 (fig. 35a) with well-developed, broad basis, with small internal 

 and very large external seta; both setae plumose. Exopodites and 

 endopodites 3-segmented; 1st endopodal segment slightly longer than 

 whole exopodite, but exopodite inserting in deep depression of basis, 

 with the result that apex of exopodite reaches as far as % 1st endopodal 

 segment. 1st exopodal segment with strong, plumose external seta, 

 no internal seta. 2nd exopodal segment with strong internal seta 

 and very small external setiform spine. 3rd exopodal segment small. 

 6 appendages: 1 fine seta at internal margin, 1 strong apical seta, and 

 4 external marginal setae with characteristic pectinate brush of hairs. 

 Large 1st endopodal segment has strong internal seta at middle of 

 internal margin. 2nd endopodal segment also with internal seta at 

 middle of internal margin. 3rd endopodal segment small, carrying 

 fine internal seta and 2 geniculate setae with pectiniform brush of 

 hairs. 



The details of legs 2 to 4 can be taken from figures 35b-d, the 

 setal formula, and the following notes. Setal formula: 



Leg 2. External seta of basis very strong. Proximal 2 spines at 

 external margin of 3rd exopodal segment small; a small spinule occurs 

 between 3rd spine at external margin and apical spine on that seg- 

 ment (fig. 356). 



Leg 3. External seta of basis fine and nude; internal setae of 1st 

 and 2nd endopodal segments long and densely plumose. External 

 margins of endopodite and exopodite strongly spinulose (fig. 35c). 



Leg 4. External margins of endopodites and exopodites strongly 

 spinulose (fig. 35d). 



Leg 5 (fig. 36/) fairly big, reaching beyond middle of genital somite. 

 External lobe of baso-endopodite well developed, with seta and some 

 spinules. Baso-endopodite small, reaching % length of exopodite, 

 with total of 3 setae. Exopodite elongate, 4 times as long as greatest 

 diameter. 5 appendages: 1 at external margin, 1 at apex, and 3 in 

 intermediate position (see fig. 36/). Setae 1, 2, and 5 strong and 

 lengthened; setae 2 and 3 small. In addition, there are 6 transverse 

 rows of spinules across the exopodite, decreasing in size distally, for 

 the position of which I refer to figure 36/. 



Remarks. — The present new form shows a very great structm'al 

 similarity with Scutellidium arthuri Poppe, but it is much smaller, 

 about half the size of that species. In its small size it approaches 

 S. purpurocincta Monk very closely (the female of S. purpurocincta 

 measures 0.65-0.68 mm.) but differs in the structure of the anten- 



