374 U.S. NATIONAL MUSEUM BULLETIN 236 



Antennules short, 6-segmented: segment 2 with outwardly turned 

 spur; segment 4 with conical process, bearing aesthetasc and seta. 

 Setation represented in figure 147(7. 



Antenna (fig. 146/) with short, ovate allobasis, bearing setose 

 internal seta. Exopodite unsegmented, with 4 notably strong setae, 

 one of which is dagger-shaped. External border of endopodite strongly 

 spinulose. 5 appendages on endopodite: 2 short spines and 3 genicu- 

 late setae. In addition, there is an appendicular seta. 



Mandible with well-shaped cutting edge at praecoxa, bearing 

 number of teeth (I could not make exact count) and large basal seta. 

 Palp indistinctly segmented, with 4 big setae; no exopodite or 

 endopodite. 



Maxillule in unfavorable position in dissection with the result that I 

 cannot describe its structure. 



Maxilla (fig. 14Qg) small, praecoxa with one small endite, bearing 

 3 setae. Coxa small, with 2 endites, each with 3 setae. Basal endite 

 slightly larger, with strong, coalescent spine and fine seta. Endopodite 

 small, styliform, 2-segmented, with 2 setae on each segment. 



Maxillipede (fig. 147^) of usual shape, chelate. Coxa apically with 

 2 setae; basis slightly swollen, nude. Endopodite composed of 2 

 indistinctly separate segments; basal segment small, apical segment 

 forming slender, acutely pointed dactylus, longer than basis. 



Leg 1 (figs. 147a, 6) slender, coxa and basis moderately long. Basis 

 with external seta, haired frontal tubercle and seta on socle carrying 

 endopodite. Exopodite 2-segmented; segments of equal length, 2nd 

 with 5 appendages. 1st endopodal segment styliform, 3 times length 

 of exopodite, 6 times as long as wide; internal margin haired. 2nd and 

 3rd endopodal segments fused, with fine seta near line of fusion: 

 they form a slender, pointed, slightly curved digit. 



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

 endopodites. The particulars are in figures 147c-e and the setal for- 

 mula: 



endopodite exopodite 



leg 2 0.210 or 111 0.1.212 



leg 3 0.310 or 220 0.1.222 or 312 



leg 4 0.221 0.1.222 



Spines along external margin of exopodites slender, almost setiform; 

 appendages of 3rd exopodal and 2nd endopodal segments closely 

 approximated, with the result that the insertion along internal or 

 external margin cannot be ascertained. Endopodites, moreover, 

 haired, with the result that small setae may have been obscured. 

 All 3rd exopodal segments are short. 



Leg 2 with long 1st endopodal segment, external margin of which 

 carries either thick hair or short seta (fig. 147c). 



Leg 4 with distinct, spinulose internal seta on 2nd endopodal 

 segment (fig. 147e). 



