194 



and redescribed the species as the type of a new genus, under the above name, 

 adding, at the same time, another supposed new species as H. Cfiriixiln. The 

 latter form, though still supported by Boeck, is, however, quite certainly, 

 nothing but the adult male of H. tul>icoln. 



Occurrence. Though nowhere in any abundance, this form seems 

 to occur along the whole coast of Norway, up to Finmark, in depths 

 varying from 20 to 100 fathoms. As stated by Prof. Lilljeborg and others, 

 it constructs itself tubes of mud for dwelling in, and this may probably 

 be the case with all the species of the genus. 



Distribution. - - Arctic Ocean : Greenland, Labrador, Iceland, Spitsbergen, 

 the Barents Sea, the Kara Sea, the Sibirian polar Sea; British Isles, coast of 

 France, Kattegat, the Baltic (in some places collected in great abundance). 



22. Haploops setosa, Boeck. 



(PI. 68, % 1). 

 Hcrploops setofsa, Boeck, Crust, amphip. bor. it arctica, p. 148. 



Body considerably more slender than in the preceding species, back 

 broadly rounded, with six fascicles of long slender seta? originating from the 

 end of the 3 last segments of mesosome and those of metasome. Cephalon 

 exceeding in length the first 2 segments of mesosome combined, frontal part 

 somewhat emarginated at the tip, lower corner distinctly angular. First 

 pair of coxal plates less expanded distally than in the type species; 4th 

 pair not nearly so dee]) at the corresponding segment, posterior projection 

 very long and acuminate. Last pair of epimeral plates of metasome slightly 

 produced at the lateral corners. First segment of urosome with a hump- 

 shaped setous prominence dorsal ly. Corneal lenses quite wanting, but 2 

 irregular patches of a reddish pigment, partly coated with white, present in 

 the usual place. Superior antennae considerably exceeding half the length 

 of the body, 2nd joint of the peduncle much elongated, flagellum twice the 

 length of the peduncle, and composed of about 24 articulations. Inferior 

 antennae about the length of the superior, the 2 last joints of the peduncle 

 comparatively longer than in H. t/tlicola. Mandibular palp extremely slender, 

 last joint linear in form, and exceeding in length the penultimate one. Gna- 

 thopoda comparatively more slender than in the type species, especially the 

 posterior ones, propodos in the anterior pair oval, in the posterior nearly 

 linear. Anterior pairs of pereiopnda with the dactylus longer than the pro- 

 podos. The 2 succeeding pairs comparatively shorter and stouter than in 

 H. hilricola; basal joint of the antepenultimate pair oval, scarcely as broad 

 as it is long, that of the penultimate pair with the anterior edge but very 



