108 U.S. NATIONAL MUSEUM BULLETIN 23 6 



5th thoracic somite suddenly greatly narrowed, with rounded 

 lateral parts, distinctly visible from above. Genital somite composed 

 of fused abdominal somites 1 and 2, big, line of fusion distinctly 

 visible in dorsal and lateral aspects as a chitinized ridge in distal third 

 of somite. Sides of genital somite distinctly swollen, greatest diameter 

 exceeds length. Some spinules near line of fusion and some at distal 

 end of somite. Abdominal somites 3 and 4 strongly telescoped, 

 combined length equal to that of genital somite, 4th longer than 3rd. 

 Some spinules at distal end of somites 3 and 4. Anal somite small, 

 with small, semicircular anal plate, visible from above. 



Furcal rami cylindrical, slightly diverging, as long as broad. 5 

 marginal setae (appendicular seta not observed, probably because 

 accumulation of dirt on abdomen made observation impossible). 

 Setae 1 and 4 of about same moderate length, seta 5 very small and 

 halfway along external furcal border. Setae 2 and 3 lengthened and 

 thickened, especially 2nd, which reaches about total body length; 3rd 

 half as long. Antennules (J&g. 36a.) moderately long, 9-segmented, 

 2nd and 3rd segments separated. 4th segment with small conical 

 process, bearing aesthetasc and 2 setae. Complete setation repre- 

 sented in figure 36a. 



Antenna (fig. 366) with basis and 1st endopodal segment separate. 

 Exopodite 4-segmented, number of setae on segments 2, 1, 1, and 3, 

 respectively. 7 spiniform setae on 2nd endopodal segment, 4 of which 

 are geniculated. 



Mandible (fig. 36c) with well-developed palp; cutting edge of 

 praecoxa small. Coxa and basis fused to form basopodite with 2 

 exceptionally strong, densely plumose setae with swollen base. 

 Endopodite small, apparently 2-segmented, segmentation indistinct, 

 with 3 and 6 setae respectively. Exopodite well developed, with 

 total of 6 setae, gradually increasing in size from base to apex, and 

 densely plumose. 



The preparation of the maxillule was unsuccessful, but I observed 

 a well-developed epipodite, with 2 very strong, densely plumose 

 setae. 



Maxilla (fig. S6d) with single praecoxal endite, bearing 2 densely 

 plumose setae with thickened bases. Coxal endite small and styliform, 

 with 2 fine setae. Basal endite well developed, coalescent with strong, 

 slightly curved spine and with additional seta. No trace of endopodite. 



MaxLllipede (fig. 36e) chelate; coxa with single spinulose internal 

 seta. Basis externally swollen, with small seta at swollen part, 

 internal margin straight. Endopodite 2-segmented; 4 setae occur on 

 1st segment, near jointing with 2nd endopodal segment, shaped as 

 curved spine. Apex of curved 2nd endopodal segment (spine) 

 almost reaches jointing between basis and coxa. 



