GAMMARIDEA 917 



spot of very short setae near middle. The posterior caudal stylets are 

 two-branched, the branches equal, pointed, and naked. 



Genus UEISTES (Dana). 



Corpus compressum, epimeris lads. Antennae, mediocres; superiores bad 

 crassce, non appendicidatm. Pedes antici subclieliformes ; secundi ver- 

 giformes, artiado styliforrni confecti ; tertii quartique brevissimi ; reliqui 

 inter sese similes et longitudine mediocres. 



Body compressed, epimerals broad. Antennas of moderate length ; the 

 superior with a stout base, not appendiculate. Anterior feet sub- 

 cheliform; second vergiform, ending in a long styliform joint; third 

 and fourth very short; remaining similar, and of moderate length. 



This genus is instituted for a species from the Antarctic seas. It 

 is peculiar in the very short third and fourth pairs of feet, which are 

 nearly concealed by the epimerals, while the others are of good size, 

 and in the absence of, an appendage to the superior antennae. The 

 anterior feet are rather slender, with the hand small ; and the last 

 joint of the second pair is long and slender. The antennae are sub- 

 equal, and the flagella of both pairs in the species examined are fur- 

 nished with peculiar lateral processes. 



The mandibles have a three-jointed palpus, a molar prominence, and 

 a pointed dentate apex. The inner maxillae have a broad, spinous 

 apex, a slender appendage within, and a two-jointed appendage on the 

 back, which has extremely short setae at apex, and a few much 

 longer on the first joint. The second maxillae have the usual form. 



The epimerals are very broad, and the anterior conceal the mouth 

 organs in a lateral view. The abdomen terminates in an oblong 

 seventh joint. The posterior stylets are rather long, and extend back- 

 ward beyond the tips of the preceding pair, and about as far as the 

 first pair. 



Uristes gigas. 



Antennas, subceqitce, crassiuscidce, \mae dimidio corporis breviores ; flagello 

 processions obtusis infra breviter fimbriate, articulis brevissimis; 2dce 



230 



