CRUSTACEA — WHITELEGGE. 



211 



Sixth and seventh segments subetjual in length ; both have 

 the anterior border strongly arched; the sides postei-iorly exhibit 

 a slight evcavation, which is adapted to the coxal plates ; the 

 posterior Ijordors are straight and furnished witli minute notches 

 externally. 



Pleon when viewed from above cylindric, without projecting 

 side processes, its width being rather more than half that of the 

 last segment of the peraeon. 



First segment rather longer than the four 

 following. 



Telson a little tapering at the sides and obtuse 

 at the extremity. 



The body and limbs are more or less beset 

 with branched sette ; on the prominent angles 

 they are stout, and when broken the bases of the 

 setse resemble small spines. Superior antennae 

 haA'ing the peduncle as long as the cephalon, 

 basal joint more than three times as long as broad, 

 outer border with three equidistant double 

 pointed denticles confined to the distal half, inner 

 border armed with eight spines arranged in 

 pairs; the largest pair is situated at about the 

 proximal third, the remainder forms a gradually 

 diminishing series; the inferior distal extremity 

 terminates in a subacute prolongation. 



Second joint as long as the width of the first, 

 becoming wider distally ; third joint equal in 

 length, but narrower than the second. 



Inner flagellum two-jointed, the second slender 

 and a little longer than the first; each is tipped by three or four 

 short simple setae. Outer flagellum with five joints subequal in 

 length, each bearing from two to six 

 longish setae. 



Inferior antennae small, about equal to 

 the length of the palp of the mandible; 

 first joint dilated, as long as the three 

 following, oval in outline, about one-sixth 

 longer than wide ; outer border evenly 

 curved and minutely spinulose about and 

 above the middle, with a large spinule at 

 distal extremity ; inner border with three 

 spinules on the distal fourth and a large 

 denticle below the middle, bounded 

 superiorly by a well defined sinus. 

 Second joint as long as broad and about half the' length of the 

 third ; fourth joint a little shorter than the second and third 



Upper Antenna. 

 Fig. 16b. 



Mandible. 

 Fig. md. 



