__^5 



taperitii;' t" the cinl. Posterior .i>;iiatli(i]i(i(la with tlio prdpodos searoply half 

 tlie lpii,i;'th (if till' carpus, I'liniiilly ex])an(le(l lielow tlie daftylus. Last pair 

 (if iiriipiida with the inner I'amus consideralily shorter than tlie outer. Telsoii 

 aliout the lengtli of tlie basal part of the last pair of uropoda, cleft beyond 

 the middle, the lobes narrowly rounded at the tip and each armed with a 

 small a])ical denticle. Body whitish., ornamented with closely set pigment- 

 ary s])(its of a beai;tiful crimson colimr forming broad transversal bands 

 over the body and partly also down the coxal plates. Length 14 mm. 



PiCiiKirJLs: — From the veiy nearly related arctic form, ,S'. hidcii/iniJnfiis 

 (Sp. Bate), the present species is easily known, as well by the far inferior 

 size, and by the broadly rounded corners of the last pair of epimeral plates of 

 the metasome. According to the figures given by Hoek of his Socarnes ovalis, 

 which is identical with the above named form, the posterior gnathopoda also 

 differ very markedly fi'om those in the present species by the pro]iodal joint 

 lieing produced to an angular corner l)Pneath the daetylns. 



Occurrence. — Off the coast of Norway this form is chiefly restricted 

 ti) the arctic region, occurring rather plentifully along the whole coast of Fin- 

 mark at moderate depths. Occasionally, however, it is also met with on the 

 west coast, as far south as Hangesund (Boeck). 



Dis/rihntion. — Arctic Ocean: (xreenland, Spitsbergen, Iceland, Novaja 

 Semi j a, the Kara Sea. 



Cien. 9. Ambasia, Boeck, 1870. 



Body rather compressed, with large and deep coxal plates. Eyes 

 with the visual elements imperfectly developed. Antennae (in female) short 

 and stout, aljout of eqnal length, antepenultimate peduncular joint of the 

 inferior ones rather elongated, flagellum in both pairs only composeil of a 

 very restricted number of articulations. Epistome projecting in front of the 

 anterior lip as a large angular plate. Posterior lip membranous, with the 

 lateral corners narrowly exserted. Mandibles rather strong, cutting edge 

 broad, molar expansion very slight, almost obsolete; palp slender, originating 

 nearer the base than does the latter. First pair of maxillae with the nmstica- 

 tory lobe less strong than usual and having a rather limited nnmlier of spines, 

 basal lobe vei-y small and roiinded, palp well developed. Second pair of maxillae 

 with the lobes nearlj' equal-sized and not very elongated. Maxillipeds with 

 the masticatory lobe very large, elliptical, palp poorly developed, only 



7 — Crustacea. 



