47 



5-articulate. Tiiferior anleiniit^ (iii female) ratlior slondp.r, flagelliun short, about 

 as long as tin- peimltiiiiato joint of tlic pednnclp, and composed id' f) joints. 

 Anterior. gnatlio])oda li;t\i)ig the l)asal joint slightly dilated and shorter than 

 the I'emaining part of the leg, propodos scarcely as long as the ('arpus, 

 dactylus very small. I'osterior gnatho])o(Li very slender, propodos abont half 

 the length (d' iiip cai'pns. Last pair id' nro])oda with the outer ramus nearly 

 twice as large as the inner, tiui latter lanceidate, unarmed. Telson oval, 

 graduall}^ tapering, cleft beyoiul the nnddle, the incision very narrow, dolour 

 dark purplish red from numerous pigmentary spots arranged in transversal 

 bands across the segments and continued down the coxal ])lates and legs. 

 Length 13 mm. 



Itcniniis. — {_)nly female specimens have hitherto been observed. 

 Thei'e is, however, every reason to believe that the male would differ from 

 the female in a manner quite analogous to that oljserved in the genera 

 Lysianassa and Socanwb: 



Occiorence. Although very I'arely met with, this beautiful Lysia- 

 nassid would seem to occur along the whole coast af Norway. I have found 

 it in several places both on the south and west coast as far north as 

 Hammerfest in Fiiimark. It is found in depths varjdng from 40 to 100 

 fathoms. Out of Norway it has not yet been recorded. 



Gen. 10. AristiaS, Boeck, 1S70. 



B()d3' short and thick, with comparatively .small coxal ])lates. Superior 

 antennaB rathei' slender, peduncle narrower than usual. Inferior antenna^, (in 

 female) shorter than the supeiior, with the antepenultimate joint of the 

 peduncle short and thick. Epistome scarcely projecting and defined from the 

 anterior liji by a small but distinct sinus. Postericn- lij) membranous, with 

 short and blunt lateral corners. Mandibles strong, cutting edge quite simple, 

 molar expansion very narrow and prominent, acuminate at the tip, palp rather 

 elongated and attached at the same level as the latter. First pair of maxilUe 

 with the masticatory lobe very bi'oad and edged with numei'oxis unequal 

 alternating spines, the basal lobe small and rounded, having f) thick ])lumose 

 seta' on the inner edge; palp normal. Second ])air of maxillte with the lobes 

 widely diverging, the inner one very broad and strongly incurved, edged 

 with numerous spiniform setse, the outer lobe much narrower and pointing 

 straight forwards. Maxillipeds comparatively small, masticatory lobe oval, ])alp 



