252 



and abruptly curved. Anterior gnatliopoda nearly as in 71/. AJdcri, except 

 tliat 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 mucli more produced than in the male of 31. 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 iiropoda 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. 



Remarhs. — 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 diiferent 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 Norway, where I have 

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

 sparingly, in a depth of 50—80 fathoms, among Hydroidse. 



Distrihiilion. — Stat. 31 and 34.3 of the Norwegian North Atlantic 

 Exjiedition. 



11. Metopa Boeckii, G. Sars, n. sp. 



(PI 88). 

 Syn: Metopa Bnizelii, 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 jilates rather large, 2nd pair scarcely tapering distally, terminal 



