118 



about the length of the cephalon and the 2 first segments of mesosome com- 

 bined, 1st joint of the peduncle very large and broad, concaved at the super- 

 ior (dorsal) edge and jutting out at the end anteriorly as a blunt projection; 

 flagellum nearly twice the length of the peduncle and composed of about 10 

 articulations, the 1st of which is very large, about equalling in length the 4 

 succeeding ones combined; accessory appendage not quite half the length of 

 the flagellum and 5-articulate. Inferior antennae nearly twice the length of 

 the superior, flagellum very slender and composed of about 22 articulations. 

 Anterior gnathopoda extremely slender and nearly naked, propodos scarcely 

 longer than the carpus and rather narrow, chela occupying the outer third 

 part of the propodos. Posterior gnathopoda somewhat longer and much 

 stronger than the anterior, propodos about half the length of the carpus, gra- 

 dually expanded distally and densely setous at the tip, palmar edge concaved 

 and defined by a projecting angle, dactylus rather strong and curved. Perei- 

 opoda of very powerful structure and edged with fascicles of short spines ; 

 carpal joint in all very short, and dactylus strong and curved; basal joint of 

 the 3 posterior pairs not very large, rounded; meral joint considerably ex- 

 panded. Last pair of uropoda with the rami naked, the inner one scarcely longer 

 than the basal joint of the outer. Telson likewise unarmed, oblong in form, 

 nearly twice as long as broad; cleft narrow, extending far beyond the middle, 

 terminal lobes blunt at the tip. Colour whitish, with a faint yellowish 

 tinge. Length of adult female 10 mm. 



Remarks. The description given by the Rev. Mr. Norman of his 

 Euonyx dielatus agrees pretty well with the present form, so that there cannot 

 be any doubt about the identity of both. As to Opis leptocliela of Sp. Bate, 

 this form, on the other hand, though evidently congeneric, would seem to 

 differ in several characters, thus in the shape of the cephalon and of the 

 coxal plates and in the small size and rounded form of the eyes. Only female 

 specimens have as yet occurred to me. It is now for the first time, added 

 to the Norwegian fauna. 



Occurrence. - I have found this remarkable form in two widely di- 

 stant localities, viz., at Vardo, Finmark, where a single specimen was pro- 

 cured from a depth of 50 60 fathoms, and in the Trondhjemsfjord. In the 

 latter locality it occurred at Leksvigen and Vennses rather sparingly in the 

 region of the deep sea corals at a depth of 100 to 150 fathoms. It was also 

 last summer procured by Mr. Storm in the outer part of the fjord, at about 

 the same depth. Mr. Norman found his specimen parasitic on EeJt/Htis escu- 

 lentus, and the same was also stated by Sp. Bate to have been the case 

 with a specimen of Opis leptocliela taken by Mr. Brady off the Isle of Man. 



Distribution. British Isles, Hebrides (Norman). 



