6t 



covered In^ tlie latter; 4tli pair (lee})ly emar(>;iiiated posteriorly and about 

 twice as deep as the body ; Bth ])air scarcely broader than it is deej). Last 

 pair of epimeral plates of metasome rounded at the posterior corners. Fii'st 

 segment of urosonie deeply impressed at tlie base dorsally. Eyes ratlier 

 largo, olilong, pigment dark l)roAvn. Superior antennae scarcely more than 

 twice tlie length of the cephalon, 1st joint of the peduncle very large and 

 tumid, flagellum about the lengtli of the peduncle, 8-articulate, with the 1st 

 joint very large, especially in the male; aecessory appendage rather elongated, 

 fj-articulate. Inferior antenna^ in female scarcely longer than the superior, 

 iu male nearly as long as the body. Anterior gnathopoda with the propodos 

 nearly globxilar expanded, the thumb-like process sharply acuminated. Poste- 

 rior gnathopoda with the propodos about half as long as the carpus and 

 slightly dilated distally. Basal joint of tlie 3 posterior pairs of pereiopoda 

 verv lai'ge, rounded oval and nearly as long a.s the remaining part of tlie 

 legs. Last pair of xxropoda with the rami much longer than the basal part, 

 outer one tlie longer and having a distinct terminal joint. Telson about three 

 times longei^ than it is broad, scarcely tapering and cleft nearly to the base, 

 each lolje having a terminal and 2 dorsal denticles. Oolour whitish with dark 

 brown intestine shining through the integuments. Length 7 — S mm. 



RrmarJcs. — As mentioned above, this is the only specie.s of the 

 genus as yet known. It has been well described by Kroyer in the Journal 

 above cited and was figured by the same author in the well known richly 

 illustrated work b^' Gaimard. 



OccuTrenee. — On the coast of Norway I have only met with this 

 form, in a single locality-, viz., in the Varangerfjord at Vadso, Finmark, where 

 2 specimens, male and female, were found at a depth of about 100 fathoms. 

 Dr. Goes and Malmgren have taken it in another locality, viz., at (Trotosund 

 in Nordland. 



Dis/riltiilini). — Arctic Ocean: Greenland, in several place.s ; Iceland. 



Gen. 5. Acidostoma, Lilljeborg, 1865. 



Body very short and roliust. with the coxal plates large and dec]). 

 Superior antennae rather different in the two sexes, having in male the peduncle 

 greatly inflated and the 1st joint of the flagellum laminarly dilated and densely 

 l)eset with long cilia; accessory appendage in both sexes unusually large, 

 nearly as long as the flagellum. Inferior antennae quite similar in tlic two 

 sexes, ratlier slender. Oral parts greatly projecting interiorly and on tlie 

 whole constructed upon a similar type as iu Tri.schizostoma. Epistomc applaii- 



G — Crustacea. 



