320 U.S. NATIONAL MUSEUM BULLETIN 23 6 



with spinules along margin and terminates in bifid point (fig. 125c). 

 3rd abdominal somite as long as 1st or 2nd (which have same length), 

 4th thoracic somite shorter. Anal somite as long as wide, slightly 

 narrowing, with big, broad genital flap and deeply cleft between 

 insertion of f ureal rami. Anal plate fringed with spinules; dorsal 

 part of distal margin of somites 2 to 4 set with small spinules. 



Furcal rami 2K times as long as wide, cylindrical, each ramus with 5 

 marginal setae and 1 appendicular seta. Setae 1, 4, 5, and appen- 

 dicular seta fine and fau'ly short; setae 2 and 3 lengthened and thick- 

 ened, especially 2nd, which reaches % length of body. 



Antennules 6-segmented, ultimate segment large, apparently re- 

 sulting from fusion of some smaller segments. 2nd segment with big, 

 outwardly directed, strong tooth with broad base. Setation repre- 

 sented in figure 126/; small 4th segment with short conical process 

 bearing aesthetasc and 2 setae. 



Antenna with allobasis and distinct, unsegmented exopodite, bear- 

 ing 4 strong setae (fig. 126^). 



Cutting edge of mandibular praecoxa with 5 foliaceous teeth and 

 fine seta; palp is composed of single, styliform segment, apparently 

 representing fused basis and coxa, bearing 4 setae; no trace of an 

 exopodite or endopodite (fig. 12Qh). 



I failed to obtain a satisfactory dissection of maxillule, maxilla, and 

 maxillipede. 



Leg 1 (fig. 126a) with 3-segmented exopodite and endopodite. 

 Coxa with external and internal fringe of long, acute spinules. Basis 

 with single external spine, placed halfway along haired external 

 margin. Exopodal segments of equal length, 2nd without internal 

 seta, 3rd with total of 4 appendages, 2 of which are geniculate setae. 

 1st endopodal segment styliform, longer than whole exopodite, 8 

 times as long as wide, internal margin with long, slender spines. 2nd 

 endopodal segment small, slender, coalescent with hooked 3rd endop- 

 odal segment, with fine seta near place of fusion. 



Legs 2 to 4 with 3-segmented exopodites and 2-segmented endopo- 

 dites. Basis with strongly haired external seta. The various details 

 appear clearly in figures 12Qb-d; the setal formula is: 



endopodite exopodite 



leg 2 0.220 0.1.123 



leg 3 0.321 0.1.223 



leg 4 0.221 0.1.223 



Leg 5 (fig. 126e) with broad baso-endopodite, reaching % length 

 of exopodite, internal margin strongly spinulose, bearing total of 5 

 setae, 2 of which are found at apex. Exopodite ovate, twice as long 

 as broad, with 5 setae and at internal margin 3 slender spinules, 

 which might easily pass as small setae. 



