044 CRUSTACEA. 



third and fourth pairs are short and rather stout ; the last three are 

 subequal, and the basal joint is quite broad. 



Gammarus orientalis, Dana, Proc. Amer. Acad., Boston, ii. 212. 



Subfamily ICILINiE. 

 Genus ICILTUS (Dana). 



Corpus valde compressum. Antenna elongates, flagellis longisconfectos; 

 inferi&res longiores. Pedes non prehe?isiles, toti vergiformes, apice 

 unguiculati. Styli caudales ' sex furcati. 



Body much compressed. Antennae elongate, and having long flagella; 

 the inferior pair longest. Feet not prehensile, all vergiform and 

 unguiculate. Caudal stylets six, furcate. 



The genus Pterygocera of Latreille has evidently close relations to 

 Icilius and some other Corophidea, though peculiar in its legs and 

 antennae. 



Icilius ellipticus. 



Cephaloihorax ellipticus, capite brevi, laid triangidato, fronte lateri- 

 busque obtusis, oeidis remotissimis, segmento proximo angustiore et 

 brevissimo. Abdomen 7-artieulatum, segmentis ti'ibus anticis postice 

 ad medium acutis, segmento ultimo parvulo, ovato. Antennas sub- 

 teretes; inferiores corpore longiores, flagello fere duplo longiore quant 

 basis, tenuissimo; superior es fere dimidio breviores, flagello non duplo 

 longiore quam basis. Pedes 4 antici infra dense Mr suti ; 3 postici 

 consimiles, tenues, fere nudi ; septimi sextis valde longiores. 



Cephalothorax oval; head short, broad triangular, front and side 

 angles obtuse ; eyes very remote ; following segment narrower and 

 very short. Abdomen seven-jointed, the last segment small ovate, 

 the three anterior at middle of posterior margin acutely prolonged. 

 Antennae subterete; inferior longer than body, flagellum about 



