554 



it also occasionally occurs off the west coast of Norway, for instance at 

 Aalesund. Off the south coast and in the Christianiafjord I have, however, 

 not yet met with it 



Distribution. Greenland (Kroyer). Spitsbergen (Goes), Iceland 



(Torell), Shetland Isles (Norman), Bohuslan (Bruzelius), Kattegat (Meinert). 



Gen. 5. LeptOCheiruS, Zaddach, 1844. 



Syn. : Ptilocheirus Stimpson. 



Protomedeia, Sp- Bate (part). 

 Boeckia, Malm. 



Body, as a rule, less slender than in the preceding genus, with the 

 urosome rather strongly built. Anterior pairs of coxal plates comparatively 

 deep; 1st pair however, poorly developed, and quite concealed by the greatly 

 expanded 2nd pair; 5th pair with the anterior lobe much deeper than the 

 posterior. Eyes distinct, though small. Antennae of moderate length, the 

 superior ones the longer, and provided with a well-developed accessory 

 appendage. Anterior lip subquadrangular in form; posterior lip with the 

 inner lobes partly fused together, and the outer ones rather broad. Mandibles 

 and maxillae normal. Maxillipeda comparatively large, with the basal and 

 masticatory lobes rather narrow, the latter edged inside and at the tip with 

 slender setiform spines, palp slender, with the penultimate joint very much 

 elongated. Gnathopoda somewhat unequal in structure ; the anterior ones distinctly 

 subcheliform, and having the ischial joint laminarly expanded; the posterior 

 ones rather slender, and densely setiferous along their anterior edge, carpus 

 very large, propodos short and conically tapering, without any distinct palm. 

 The !? anterior pairs of pereiopoda with the propodal joint unusually slender 

 and elongated; the 3 posterior pairs rapidly increasing in length, and having 

 the basal joint large and expanded. The 2 anterior pairs of uropoda very 

 robust, and armed with strong unguiform spines \ last pair comparatively 

 small. Telson likewise rather small, and tubular. 



Remarks. This genus was established in the year 1844 by Zaddach, 

 to include a curious Amphiphod found by him at the coast of Prussia. 

 Stimpson's genus Ptilocheirus (1854) is undoubtedly the same, and this is also 

 the case with the genus Boeckia of Malm. The generic name proposed by 

 Zaddach is inconveniently near Leptochirus, which has been appropriated for 

 an insect, but it may perhaps be retained. The genus was considered by Boeck 



