142 



with the basal joint somewhat smaller and more regularly oval in form; last 

 pair considerably larger than any of the jjreeeding pairs, basal joint smooth, 

 oblong oval, somewhat longer than the remaining part of the leg, and forming 

 posteriorly a detlexed rounded lobe reaching nearly to the end of the meral 

 joint. Last pair of uroj)oda with the inner ramus a little shorter than the 

 outer, both broadly lanceolate in form. Telson in female suljtriangular, cleft 

 extending far beyond the middle and very narrow, fissure-like; ' in male 

 somewhat more regularly oval in form ; in both sexes nearly smooth, excepting a 

 pair very small hair-like bristles at the tip. Colour whitish, pellucid, with 

 an orange tinge on the antennae and leg.«. Length of adult female 5 mm, 

 of male 6 mm. 



Remarks. — This is the only as yet known species of the genus and 

 cannot be confounded with any other Amphipod. The rather marked sexual 

 difference, present in this genus, has prevented Prof. Meinert from recognizing, 

 in the form he describes as GhinKeropsis danica, the adult male of Argissa fypica 

 of Boeck. That both these forms belong to one and the same sjiecies cannot 

 be questioned. 



Occurrence. — I have met with this remarkable form in two localities 

 off Finmark, viz., at Mehavn, near the North Cape, and in the Varangerfjord, 

 at Vadso. Li both localities it occuiTed, not infrequently, on a muddy bottom, 

 depth varying from 20 to 100 fathoms. A single specimen I have taken at 

 Egersiind, soiith coast of Norway, and Boeck records it also from Christiania- 

 fjord. It thus seems to occur along the whole coast of Norway. The animal 

 is rather sluggish, and, when brought under the microscope, secretes a clear 

 viscid fluid, probably derived from some glandular bodies found imbedded 

 within the basal joint of the 3 posterior pairs of pereiopoda. 



Didrihution. — Grreenland (Hansen), Kattegat (Meinert). 



Fam. 4. Phoxocephalidae. 



Body more or less fusiform in shape. Cephalon produced in front to 

 a hooded rostrum covering over the base of the antennae, lateral corners 

 obsolete, postantennal angle distinct. Coxal plates rather large, the 4 anterior 

 pairs obtusely truncated at the tip; 4th pair- the largest; 5th pair bilobed, 

 the posterior lobe the deeper. Metasome not very jjowerful except in the 

 male. Urosome in female rather stout, in male nmcli narrower and ha^ang 

 the segments more or less distinctly carinated dorsally. Eyes, when present, 

 placed on the sides of the cephalon. Antennae in female comparatively short. 



