﻿180 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lOO 



lateral lobes is very obvious. Second to last abdominal segments equal 

 in size, posterior margin of each with a row of fine teeth. Furcal 

 rami 2.25 times as long as wide, both lateral and mesial margin hair- 

 less, no oblique row of spinules from the base of the lateral seta run- 

 ning mesially on the dorsal surface. Lateral seta large, about half 

 the length of the outer corner spine, inserted at about the middle of the 

 ramus on the dorsal surface. Dorsal seta long and slender, about as 

 long as the inner corner seta, inserted near the caudal end on the 

 dorsal surface between the origin of the inner and outer apical setae. 

 Outer corner spine stout, with fine plumage on mesial surface, shorter 

 than the inner corner seta, which is about 1.6 times as long. Inner 

 apical seta longest, about as long as the abdominal somites and furcal 

 rami together. Eatio between this seta and furca 7.2 : 1. Outer apical 

 seta about five-sixths as long as the inner apical seta. First antenna 

 long, reaching third thoracic somite, of 12 joints; appendages on first, 

 fourth, and ninth joints very long. Second antenna of four joints, last 

 two joints about equal in length, seta on basal joint not very long, 

 reaching only a little beyond the second joint. All four pairs of 

 swimming legs with 3-jointed rami ; spine formula 3.4.4.3 ; appendages 

 on endopodites of all four legs similar; inner surface of first joint 

 with one seta, of second with two, and of third with three setae, third 

 joint of endopodite with two apical and one lateral setae. Distal mar- 

 gin of first and second joint of each ramus of each leg with a row of fine 

 spinules. First pair of legs with shorter joints than the others, coxa 

 and basis (first and second protopodite) with long stout setae, outer 

 fringe of coxa with three or four stiff hairs, setae on all joints of about 

 the same length; first and second joints of exopodite with one mesial 

 seta and one lateral spine each; third joint with three lateral spines 

 and five setae; uniting lamella between coxa with concave, smooth 

 margin on the middle third of its posterior border. Leg 2 longer than 

 leg 1 ; outer edge of second joint of endopodite bordered with fine hairs 

 (fig. 23, k) ; third joint of exopodite with four spines and five setae; 

 Leg 3 with similar number of spines and setae as leg 2 ; uniting lamella 

 with a row of spinules across the middle of its ventral surface, leaving 

 its posterior border smooth (fig. 23, /). Third joint of endopodite of 

 leg 4 more than three times (3.7) as long as wide, two terminal setae 

 unequal, inner one twice as long as the outer, slightly curved, uniting 

 lamella with convex posterior border covered with a row of spinules. 

 Fifth rudimentary leg with one single plate carrying three append- 

 ages: median one thickest, more like a spine than a bristle, lateral 

 seta shortest, seta between these two longest ; fine hairs present on all 

 three appendages (fig. 23, j) . 



Male : Slightly smaller than female. First antenna modified, short, 

 and stout. Leg 5 as in female but with broader basal plate. Abdomen 



