GAMMARIDEA. 95I 



Sooloo Sea, in six and a half fathoms water. Collected, February 2, 

 1842. * 



Length, three lines. The epimerals are very short, the anterior 

 not larger than the fifth pair, the fifth smaller than the fourth. The 

 inferior antennae are about three-fourths the length of the superior, 

 and the setae below are much longer than in that pair. The first 

 basal joint has the inferior apex projecting and subacute. The hand 

 of the second pair of legs is half shorter and narrower. The third 

 and fourth pairs of feet are subequal. The fifth is less than half the 

 seventh. The first and second pairs of stylets extend back the same 

 distance; the third pair is furnished with some short hairs and no 

 spinules. 



Gammarus tenuis, Dana, Proc. Amer. Acad. Sci., ii. 211. 



Gammarus furcicornis. 



Gracilis, epimeris angustis; sparsim pubescens. Caput fere oblongum, 

 fronte laterali non prominente. Antennae \rnae, corpore breviores, arti- 

 calo lmo crasso, oblongo, 2do paulo longiore, Stio brevi; flagello terete, 

 parce longiore quam basis, ferme li-articulato, sparsim setuloso; appen- 

 dice dimidio breviore, b-articulatd. Antennae 2dce valde breviores, basi 

 vix breviore quam basis Imarum, articulis Stio itoque longis, sub- 

 cequis; flagello parce longiore quam articulus Stius, 7-10-articulato. 

 Pedes lmi parvuli, manu subovaUi; 2di validi, manu lata et oblongd, 

 trapezoided, infra setigerd, apice parce latiore et fere recth truncatd pal- 

 mam efficiente, jxdmd non excavatd, carpo transverso, subrectangulato. 

 Pedes 6 postici subcequi, lmi paulo longiores, setis numerosis, breves. 

 Styli caudales postici longissimi. 



Slender, epimerals narrow ; body sparsely pubescent. Head about as 

 long as high ; lateral margin in front not prominent. Superior an- 

 tennae shorter than the body, first joint very stout, oblong; second 

 slender, a little longer; third short; flagellum terete, a little longer 

 than the base, about fourteen-jointed, sparsely setulose, appendage 

 half shorter than flagellum, five-jointed. Inferior pair much shorter 

 than superior, the base of same length nearly as in that pair, third 



