36 



Occuf fence. The only specimen met with, an adult ovigerous female, 

 was found many years ago hy the author at Bukken on the west coast of 

 Norway, the depth not recorded. 



(!en. 4. Opisa, Boeck, 187(3. 

 Syn : Opis, Kroyer. 



Body rather robust, with broadly rounded back and very large and 

 deep coxal plates. Antenna in female very short, the inferior ones of male, 

 however, greatly elongated and furnished at the anterior edge of the flagellum 

 with a regular series of calceolse. Epistome not very projecting and defined 

 from the anterior lip by a slight sinus. Mandibles of the usual structure, 

 palp originating nearer to the base than does the molar expansion, rather 

 slender, 2nd joint densely setiferous on the inner edge. Maxillae about as in 

 Normania, Maxillipeds witli the palp normal but comparatively short, only 

 slightly reaching beyond the masticatory lobes; the latter rather large, oblong, 

 angular at the tip, inner edge denticulated. Anterior gnathopoda prehensile, 

 terminating with a very large forcipated hand, the inferior angle of the pro- 

 podos being produced to an unguiform process, against which the greatly 

 curved dactylns admits of being impinged. Posterior gnathopoda of the usual 

 slender form, propodal joint oval, truncated at the tip. Pereiopoda not very 

 elongated, basal joint of the 3 posterior pairs greatly dilated. Branchial 

 lamellae normal. Last pair of uropoda reaching beyond the preceding pair, 

 rami densely setous at the inner edge. Telson very elongated and deeply cleft. 



Remarl;s. - - The generic name Opis proposed by Kroyer having been 

 employed in Zoology at an earlier date, Boeck has seen fit to make the above 

 slight change by adding the feminine termination. The genus is chiefly 

 distinguished by the peculiar forcipate character of the anterior gnathopoda. 

 It only comprises as yet a single species ; for the several forms referred by 

 other authors to this genus have turned out to be in fact generically distinct. 



4. Opisa Eshcrichti, (Kroyer). 



(PI. 14, fig. 1). 



Opis Eschrichti, Kroyer, Natnrh. Tidsskr. 1 ser. V. 4, p. 149. 

 Syn: Opt* /t//>i<-<t, Kroyer. 



Body glabrous, rather thick, with evenly vaulted back. Cephalon 

 rather short, with the. lateral corners somewhat projecting and narrowly 

 rounded. First pair of coxal plates much smaller than the 2nd and partly. 



