252 



and abruptly curved. Anterior gnathopoda nearly as in M. Alderi, except 

 that the propodos appears somewhat smaller in proportion to the carpus. 

 Posterior gnathopoda likewise rather similar to those in the said species, 

 though perhaps somewhat more powerful, propodos in female with the palm 

 comparatively more oblique, and exceeding in length the hind margin, its 

 posterior sinus considerably deeper; that of the male very large, nearly 

 occupying half the length of the leg, the acuminate lappet of the inferior 

 edge much more produced than in the male of M. Alderi, and the sinus in 

 front of it deeper, anterior part of the propodos narrower and more produced, 

 with the lamellar expansion below the dactylus somewhat differently shaped, 

 and having the lower denticle much larger than the others. Pereiopoda of much 

 the same structure as in the preceding species. Last pair of uropoda with the 

 basal joint fully as long as the other 2 combined, and armed with 5 small 

 denticles. Telson comparatively narrower than in M. Alderi, fully twice as 

 long as it is broad, and somewhat narrowed in its outer part. Body whitish, 

 pellucid, with a few small reddish patches. Length of adult female 

 reaching 14 mm. 



Bemarks. This form is so closely allied to M. Alderi, that its 

 specific distinctness could perhaps be questioned. Yet there are some 

 apparently constant characteristics, by which it may easily be distinguished 

 from the above-named species. Thus the eyes are comparatively smaller, 

 the antennae much more unequal, and the structure of the posterior gnatho- 

 poda, though built upon the same type, yet somewhat different in both 

 sexes, not to speak of the great difference between the 2 species, as 

 regards size. 



Occurrence. - - The only place off the coast of Norwa_y, where I have 

 met with this form, is at Hammerfest, Finmark. It occurred here rather 

 sparingly, in a depth of 50 80 fathoms, among Hydroidae. 



Distribution. Stat. 31 and 343 of the Norwegian North Atlantic 

 Expedition. 



11. Metopa Boeckii, Gr. 0. Sars, n. sp. 



(PI. 88). 



Syn: Metopa Bruzelii, Boeck (not Goes). 

 Metopa borealis, G. O. Sars (part). 



Body considerably more slender and compressed than in the 2 

 preceding species. Cephalon nearly twice as long as the 1st segment of 

 mesosome, lateral corners somewhat projecting, and angular at the tip. 

 Coxal plates rather large, 2nd pair scarcely tapering distally, terminal 



