625 



longer than the carpus, but considerably expanded distally, being nearly 

 triangular in form, palm almost transverse, with two small dentiform projec- 

 tions in the middle, and defined below by a somewhat niQre projecting tooth, 

 dactylus much longer than tlie ])alm and setous outside; anterior gnathopoda in 

 male of a similar structure to that in the female, but comparatively more strongly 

 built, with the propodos larger and the projections of the palm much more 

 prominent. Posterior gnathopoda of same appearance in the two sexes, being 

 somewhat smaller than the anterior, propodos rather expanded and oval 

 triangular in form, with the palm rather oblique, and without distinct projec- 

 tions, being defined below by a rounded corner, dactylus slender and elongated. 

 The 2 anterior pairs of pereiopoda subequal and very slender, with the last 

 2 joints of about same length, and edged inside with small spines and slender 

 bristles, dactylus of moderate size. Antepenultimate pair about as long as 

 the latter, and having the carpal joint much shorter than the propodal one 

 and densely setous in front, dactylus comparatively small. The 2 posterior 

 pairs considerably more elongated, with the meral joint much prolonged and 

 the carpal one quite short, dactylus strongly developed and falciform. The 

 2 anterior pairs of uropoda with the rami narrow linear in form, and fringed 

 on both edges with numerous spines; last pair very small, with the terminal 

 joint nearly .3 times as long as the basal one, and edged with a number of 

 delicate bristles. Telson quite unarmed, and gradually tapering distally, tip 

 obtusely pointed. Body seraipellucid, anrl of a uniform yellowish hue. 

 Length of adult female 25 mm., of male 28 mm. 



T'emarks. — This peculiar Amphipod cannot be confounded with any 

 of the other northern Amphipoda, exhibiting, as it does, a most strange 

 appearance by its long and slender body, and extremely elongated antennae 

 and legs. From the North American species described by Prof. S. Smith, it 

 is easily distinguished, among other things, by the want of distinctly deve- 

 loped eyes. 



Occurrence. — Boeck found a single, somewhat imperfect specimen of 

 this form in the Christianiafjord, at Moss. I have myself dredged it occasion- 

 ally both off the west and north coasts of Norway in depths ranging from 

 100 to 300 fathoms; but, as the animal is extremely brittle, it is veiy 

 seldom that any specimen is taken with all its appendages uninjured. 



Distrihution. — Skaggerak (Gunhilds Exped.), Kattegat (Meinert), off 

 Spitsbergen and the Fseroe Isles (Norw. North. Atl. Exped ). 



