59 



produced anteriorly, accessory appendage 4-articalate. Inferior antenna:' about 

 as in H. propinqvus. Anterior gnatliopoda with the propodos comparatively 

 shorter than in the 2 preceding species. Dactylus of the pereiojxida, ]'ather 

 elongated. Last pair of uropoda scarcely different from those in H. propinqvus. 

 Telson, on the other hand, comparatively broader, -with the incision less 

 narrowed anteriorly. Length of young male 16 mm. 



Eemarlcs. — Although the present species cannot properly be referred 

 to the Norwegian fanna, heving not yet been found out of the polar seas, I 

 have tlionght it right to describe and figure it liere, in order to elucidate 

 more closely, than has been done by Dr. Hansen, the characters by which 

 this form is distinguished both from H. denticuJafus and propinqvus. Among 

 tliese characters the peculiar sculpture of the integuments, the presence of 

 a distinct ocular lens, and tlie comparatively short posterior projection of the 

 last pair of epimeral plates of the metasome are the most conspicuous. The 

 figures here given are drawn from a specimen procured on the Norwegian 

 North Atlantic Expedition oflF Jan Ma3'en. Also the form mentioned and 

 figured by tlie author in liis Report on the Crustacea of the said Expedition, 

 as H. HolhoUi, rar., must, in spite of the total absence of eyes, be referred 

 to the pi'esent species, as the integuments in most of the specimens exhibit 

 a very similar close striation as in the typical form. 



Bisfribution. — Arctic Ocean: Greenland, Spitsbergen, Jan Mayen, the 

 Murman coast, the White Sea, Matotschinskar. 



Gren. 14. Orchomene, Boeck, 1870. 



Body, as a rule, rather thickset, with the segments of mesosome 

 gradually increasing in size posteriorly, and the coxal plates very large. 

 Last pair of epimeral plates of metasome not produced at the infero-lateral 

 corners, posterior edge more or less coarsely serrated. Superior anteuiue com- 

 paratively short, with the accessory appendage well developed. Liferior 

 antennae in female about the length of the superior, with the antepenultimate 

 joint of the peduncle rather produced, in male very slender and elongated, 

 with the flagellum filiform and provided, like that of the superior ones, witli 

 distinct calceolse. Epistome projecting in front of tlie anterior lij) as a more 

 or less prominent rounded lamina, overhanging the anterior lip in front. 

 Posterior lip strongly chitinized, with projecting lateral corners. Mandibles 

 elongated, with the molar expansion very small; palp slender, originating 



