37 



covered by the latter; 4th pair deeply emarginated posteriorly and about 

 twice as deep as the body; 5th pair scarcely broader than it is dee]). Last 

 pair of epimeral plates of metasome rounded at the posterior corners. First 

 segment of nrosome deeply impressed at the base dorsallv. Kves ralh.-r 

 large, oblong, pigment dark brown. Superior antennae scarcely more than 

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

 tumid, flagellum about the length of the peduncle, 8-artieulate, witli the 1st 

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

 5-articulate. Inferior antennae, in female scarcely longer than the superior, 

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

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

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

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

 very large, rounded oval and nearly as long as the remaining part of the 

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

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

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

 each lobe having a terminal and 2 dorsal denticles, dolour whitish with dark 

 brown intestine shining through the integuments. Length 7 8 mm. 



Piemarl's. As mentioned above, this is the only species of the 



e-enus as vet known. It has been well described by Kroyer in the Journal 



O \J / t/ 



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

 illustrated work by Graimard. 



Occurrence. 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. (Iocs and Malmgren have taken it in another locality, viz., at Grotosnnd 

 in Nordland. 



Distribution. Arctic Ocean: Greenland, in several places; Iceland. 



Gen. 5. Acidostoma, Lilljeborg, 1865. 



Body very short and robust, with the coxa! plates large and deep. 

 Superior antenna- rather different in the two sexes, haying in male the peduncle 

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

 beset with long cilia; accessory appendage in both sexes unusually large. 

 nearly as long as the nagellum. Inferior antenna <|uitc similar in the two 

 sexes, rather slender. Oral parts greatly projecting interiorly and on the 

 whole constructed upon a similar type as in Trischixostoma. Kpislom.- applan- 



G Crustacea. 



