20 U.S. NATIONAL MUSEUM BULLETIN 236 



Praecoxa of maxillule with well-developed arthrite, carrying 9 

 strongly developed, spiniform setae, some of which are spinulose. 

 Endites of coxa and basis well developed but almost concealed by 

 arthrite, basal endite largest, each with 3 setae. 4th segment with 

 4 plumose setae at internal margin. Coxal exite (epipodite) small, 

 with 4 long setae. Basal exite well developed, with 1 seta. Exop- 

 odite well developed, inserting at base of 4th segment, reaching 

 half its length. There are 10 marginal setae. Endopodite set at 

 right angle with 4th segment, apparently 3-segmented, but segmenta- 

 tion, even in stained preparation, almost invisible. The segments 

 have 3, 3, and 5 setae respectively (fig. 3e). 



Maxilla with well-developed praecoxa, distinctly separate from coxa. 

 There are 2 praecoxal endites, proximal with 4, distal with 3 strongly 

 plumose setae. Coxa with 2 slightly lengthened endites, with each 3 

 plumose setae. Basipodite not divided, with 1 thick endite, carrying 

 2 strong, curved, spiniform setae and a much smaller seta. Endop- 

 odite distinct, 2-segmented, with 2 and 3 setae respectively (fig. 3/). 



Coxa of raaxUlipede with 4 lobules or endites, with 0, 0, 3, and 1 

 setae respectively. Setae on proximal lobes may have been removed 

 by dissection, as well as one of the setae on the distal lobe, leaving 

 only the strong, spinulose seta. Basis well developed, triangular by 

 development of strong, apical internal lobe, carrying 3 setae. Endop- 

 odite 4-segmented, with 2, 2, 2, and 3 setae respectively. In addi- 

 tion, there is an external seta on segment 2 (fig. 4/). 



Endopodites and exopodites of legs 1 to 4, 3-segmented. All setae 

 on the legs have the following structures: Basal part strongly devel- 

 oped, tubiform. At about half the length of a seta there is a sudden 

 constriction; the remainder of the seta is fine. The whole seta is 

 plumose. The spines usually have a broad, serrated lamina, spear- 

 shaped in outline. 



Leg 1 (fig. 4a) with internal seta at coxa, basis with blunt internal 

 spine. 1st segment of endopodite with 1 internal, 2nd with 2 internal, 

 and 3rd with 3 internal setae. 1st segment of endopodite without 

 spine at external margin; 2nd with external margin terminating in a 

 short spine; 3rd segment with external seta, 1 short apical spine and 

 2 apical setae on internal side of that spine. 1st segment of exop- 

 odite with 1 internal, 2nd with 1 internal, and 3rd with 3 internal 

 setae. External margin of 1st and 2nd exopodal segments distally 

 with spear-shaped spine; 2nd segment, in addition, with small proximal 

 and larger distal spinule at base of this large spine. External margin 

 of 3rd exopodal segment with 2 spines at external margin, preceded 

 by a small spine, with the result that, at first glance, 3 external mar- 

 ginal spines appear to be present. Apex of 3rd exopodal segment 

 with long terminal spine, 1^ times length of segment, with serrated ex- 



