80 



low and angularly produced postei'iorly, 5tli pair a little more broad than deep, 

 with the posterior edge obtusely angulated on the middle. Last pair of epiraeral 

 plates of metasome produced at the infero-lateral corners to a short and blunt 

 point, posterior edge arched. First segment of urosome deeply impressed dor- 

 sally and exhibiting below the depression a rounded carina advancing over 

 the succeeding segment. Eyes rather large, oval or reniform, pigment pale 

 red. Superior antennge with the peduncle rather thick and massive; flagellirm 

 scarcely twice as long and 11-articulate, 1st joint very large, about the length 

 of the 5 succeeding joints combined; accessory appendage exceeding half the 

 length of the fiagellum, 10-artieulate, 1st joint cansiderably larger than any 

 of the others. Inferior antennse in female somewhat longer than the superior, 

 flagellum composed of about 22 articulations. Epistome forming a narrow 

 rounded lobe overhanging the anterior lip in front. Anterior gnathopoda of 

 the usvial structure, propodos shorter than the carpi;s and transverse^ truncated 

 at the tip, inferior corner rectangular. Posterior gnathopoda very slender, pro- 

 podos oblong oval, about half the length of the carpus and scarcely as broad. 

 Pereioj^oda slender, basal joint of the 3 posterior pairs very large. Last pair 

 of uropoda larger than usual, inner ramus scarcely longer than the basal 

 joint of the outer, both provided on the inner edge near the tip with a few 

 small setse. Telson oblong oval, very slightly tapering distally, with 3 or 4 

 pairs of dorsal denticles, cleft very deep and narrow. Body whitish pellucid, 

 with a few scattered patches of a difFuse orange-coloured pigment. Length of 

 adult female 8 mm. 



Bemarls. — The present species, discovered by Prof. Lilljeborg, is 

 easily distinguishable from any of tlie preceding ones by the slender compres- 

 sed body, the form of the last pair of epimeral plates of metasome and by 

 the rounded dorsal carina of the 1st segment of the urosome. Moreover there 

 are in the anatomical details several well marked characters to distinguish 

 this species from the other northern forms of the genus. 



Occurrence. — I have met with this species in several places oif the 

 west coast of Norway, as also in Lofoten and off the Finmark coast, in depths 

 varying from 50 to 100 fathoms. Quite recently I collected a great number 

 of specimens in the Trondhjemsfjord from the back of a living skate (Raja 

 batis) just broi^ght up by a fishing line from a depth of about 80 fathoms. 



Distribution. — Coast of Bohuslan (Bruzelius); Denmark (Meinert); Shet- 

 land isles (Norman) ; Greenland (Hansen); ofFJanMayen (Norw. North- Atlantic 

 Expedition). 



