134 U.S. NATIONAL MUSEUM BULLETIN 236 



from apex. Endopodite unsegmented, curved, pointed, shorter than 

 basis, smooth, with single seta almost at base (fig. 47/). 



Leg 1 (fig. 48a) with haired lamella along external margin of coxa. 

 Basis with haired external margin and internal and external seta. 

 Exopodite inserting on distinct socle, 3-segmented. Apex of 1st 

 exopodal segment reaching as far as apex of 2nd endopodal segment, 

 with 1 external seta. 2nd exopodal segment Iji length of 1st, with 

 internal and external seta. Terminal 3rd exopodal segment small, 

 with two lateral, curved spinules and 2 apical, big claws, differing 

 in size, Endopodite 2-segmented: 1st segment with haired external 

 margin and strong internal seta, placed on distinct socle and reaching 

 apex of 2nd segment; 2nd endopodal segment with haired margins, 

 carrying 4 setae, 2 apical and 2 internal. Apical setae fine, internal 

 setae with thickened base, gradually flattening and provided with 

 thin lamellar edge, distinctly visible only in stained preparations. 



The details of legs 2 to 4 appear from figures 4:8b-d, the setal for- 

 mula, and the following notes. Setal formula: 



Legs 2 to 4 have transversally elongated bases and 3-segmented 

 exopodites and endopodites. 



Leg 5 (fig. 48e) with well-developed, conical, external lobe of baso- 

 endopodite, reaching halfway along exopodite, not quite reaching base 

 of internal seta and carrying fine seta. Baso-endopodite very short, 

 with strong seta and fine, hairlike seta. Exopodite with 5 marginal 

 setae: 3 (2 fine and nude, 1 plumose and strong) apical; 2 placed along 

 internal border that are long and plumose. 



Color whitish opaque, without a trace of eyes or pigmented spots. 



Remarks. — Peltidium intermedium originally was described from a 

 single female specimen, 0.87 mm. long, captiu-ed by the Siboga Expedi- 

 tion in the Malay Archipelago, off Saleyer, among surface plankton 

 (A. Scott, 1909). The specimen apparently was dissected and the 

 slides were lost. But for small details in the armature of the carapace, 

 which armature may be slightly variable, the present specimen agrees 

 very well with A. Scott's description, especially the shape of the body 

 and the structure of legs 1 and 5. 



The Ifaluk specimen was obtained in washings of the alga Halimeda 

 from the bottom of the ship's passage, at a depth of 13 to 14 feet, 

 between Fallalap and Ella islets in Ifaluk Atoll. 



