\MNI1PODA. 11 



Firtt pcrttapods: Side platen narrow, widening distally, curved. (Vixopoditc 



distinct, about une-third the length of the Hide plate. First joint subcqual to the next 



two, widening -li-tally ; third joint rather wider at the distal end than the tint at the 



same point ; second, third, and fourth setose, fifth spinous on the hind margin. 



'id I- i;> ftdl l.;k. the tir-i. UMfl ttl Ml |>l.it - ( - \nA\ 



Third peraopods: Side plates as deep as the leg is long, widening below, 



the hind margin angulate below, the front rounded. First joint wider than 



long, with the hind margin excavate and setose al>ove and oliscurely crenate below ; 



hind margin of the third joint produced to the middle of the next and terminating in a 



spiuous point ; the front margin of all the joint* except the first is armed with short 



Fmtrth jxrseopods : First joint subovate, very olwcurely crenate behind. 



Fifth ptrmopod*: First joint much wider than that of the fourth pair, the hind 

 margin distinctly crenate in the middle. 



First and second uropods: The peduncles as long as the outer rami, the inner 

 rather shorter. 



Third uropods : Rami rather longer than the peduncles, the outer rather the longer, 

 with spines on the outer and long setae on the inner margin. 



Telm cleft nearly to its base, reaching to the middle of the rami of the third 

 uropods. 



AKISTIAS ANTARCTIC-US. (PI. 3, fig. 5.) 

 Aritttatanlarftifut, A. 0. Walker, Ann. and Mag. Nat. Hist. XVII. < I :;.. p. 454. 



W.Q., 28 Feb., 1902, Millurdo Bay, 20 fm., one, length 15 mm. ; D., 5 June, 

 1902, one smaller. 



Body moderately compressed, without cariuse or teeth. 



Head shorter than the first segment ; ocular lolie produced to the end of the first 

 joint of the upper antennae, rounded at the apex. Eyes large, dark, expanded 

 below. 



Body-segments increasing in length backwards. First four side-plates about as 

 deep as the segments, the first concealed by the second ; the fourth moderately pro- 

 duced behind ; the fifth much wider than deep. Posterior angle of the third pleoti 

 segment produced backwards, acute. First urus segment depressed in front ; second 

 ami third almost concealed by the first, and perhaps coalesced. 



Upper and lower antennas subequal, scarcely reaching the end of the third segment. 



Upper antenna: First joint rather longer than the second and third, the lower 

 margin projecting distally ; second twice as long as the third, lower margin projecting. 

 Flagellum ten-jointed, the first joint setose, as long as the next three joints, which are 

 distally setose. Appendage five-jointed, the first the longest, the rest sul>equal. 



Lower antennse : First joint twice as wide as long ; second and third subequal, 

 about three times as long as the first ; flagellum ten-jointed. 



