14 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 123 



bristle short, slender with few spines distally; between b- and c- 

 bristles, 1 short and 1 medium spinous bristle; between c- and d- 

 bristles, 1 long stout spinous bristle; following d-bristle, 1 medium 

 slender spinous bristle) ; ventral margin of 2nd joint with 1 medium 

 and 2 long spinous bristles; medial side near base of c-bristle with 4 

 to 5 unequal spinous bristles in row; end joint with 1 bare stout claw 

 and 1 short and 4 long bristles. Basale endite with 4 (rarely 3) pec- 

 tinate terminal bristles, 1 short bare bristle and 4 (rarely 3) triaenid 

 bristles with 4 pairs of spines; glandular peg well developed; dorsal 

 margin of basale with 2 slender terminal bristles with short spines. 

 Coxale: ventral branch with long and short spines in roughly 4 trans- 

 verse rows and several small spines or hairs near tip; dorsal branch: 

 ventral margin with 6 rounded teeth and distally a crest of spines; 

 terminal margin with short spines in row and slender terminal spine; 

 dorsal margin with long slender hirsute spine near terminal end. 

 (Distal part of dorsal branch of coxale missing on most specimens 

 examined.) 



The right mandible on a female examined is aberrant, having on 

 the 2nd joint of the endopodite only 2 bristles on the dorsal margin, 

 2 on the ventral margin, and 2 on the medial surface (fig. 56) , and also 

 in having 2 of the 3 ventral bristles on the 1st endopodite joint fused 

 along their proximal %; the 3rd bristle is bifurcate at the tip; the 

 2nd endopodite joint is almost % the length of the same joint on the 

 normal left mandible; the end joint is larger than the end joint of the 

 normal mandible and does not have a small medial bristle. 



Male mandible (fig. 6m) : 2nd joint of endopodite differs from female 

 in having on dorsal margin 1 additional bristle proximal to a-bristle, 

 and, on some specimens an additional short bristle between b- and c- 

 bristles, and in greater spinosity of medial surface. Basale endite 

 differs in having 4 to 7 pairs of spines on triaenid bristles compared to 

 4 on female. 



Maxilla (figs. 5j, 7a) : No sexual dimorphism. Epipodite pointed 

 and hirsute. Proximal endite with 1 short and 3 long bristles; distal 

 endite with 3 long bristles. Dorsal margin of basale hirsute, with 2 

 short bare bristles; ventral margin with short bare bristle near middle 

 and long spinous distal bristle. Endopodite: 1st joint with 1 short 

 bare anterior bristle and 1 medium terminal bristle; end joint with 

 1 long spinous bristle. Proximal spear-shaped bristle of baleen comb 

 longer than adjacent oar-formed bristles. 



5th limb (figs. 5k, I) : No sexual dimorphism. Form of appendage 

 typical for genus. Epipodial appendage with 59 to 60 marginal 



