254 



distinguished by the form and armature of the last pair of uropoda and of 

 the telson. 



Occurrence. — I have hitherto met with this species only in a few 

 places, viz., at Tjoto, off the Nordland coast, and at Hammerfest, Finmark. 

 Boeck records it from Hangesund, west coast of Norway, and Mr. Schneider 

 has quite recently collected it rather abundantly in the neighbourhood of 

 Troms0. I have no knowledge of its having been found out of Norway. 



12. Metopa borealis, G. 0. Sars. 



(PI. 89, %. 1). 

 Metopa hoi-etdis, G. O. Sars, Overs. Norges Crust. I, p. 91, PI. 4, fig. i. (but not fig. 1 a). 



Body rather stout and somewhat resembling that of M. Alderi. Cepha- 

 lon scarcely twice as long as the 1st segment of m.esosome, lateral corners 

 evenly rounded off. Coxal plates large; 2nd pair with the anterior edge 

 strongly curved in the middle, tip obtusely pointed ; 3rd pair about twice as 

 deep as the corresponding segment, and aboi;t of same breadth throughout; 

 4th pair much larger than the 2 preceding pairs combined, and about as 

 broad as they are deep, distal edge rather oblique, and but slightly curved. 

 Last pair of epimeral plates of metasome with the lateral corners acutely 

 produced. Eyes not very large, rounded, pigment dark red. Antennae 

 comparatively short, the superior ones scarcely exceeding in length a 3rd 

 part of the body, 1st joint of the peduncle about the length of the other 2 

 combined, flagellum half as long again as the peduncle, and composed of 

 about 12 articulations. Inferior antennae scarcely longer than the superior, 

 last joint of the peduncle a little exceeding the length of the penultimate 

 one, flagellum about the same length. Anterior gnathopoda comparatively 

 small, meral joint but little produced at the end inferiorly, propodos about 

 the length of the carpus, and of regular oblong oval form. Posterior gnathopoda 

 moderately strong, meral joint withoiit any distinct ascending lamella inside, 

 propodos much shorter than the basal joint, and very slightly expanded 

 distally, palm somewhat oblique and about the length of the hind margin, 

 from which it is defined by a distinct dentiform projection, its edge nearly 

 straight, and coarsely dentated throughout, some of the denticles being 

 stronger than the rest. Pereiopoda much stronger than in M. BoecJcii and 

 more resembling those in 31. Alderi; last pair with the basal joint regular 

 oval in form, meral joint rather dilated, and considerably produced at the 

 infero-posteal corner. Last pair of uropoda rather short, basal joint not 

 nearly attaining the length of the other 2 combined, and armed witli only 



