486 



3. Melphidippa borealis, Boeck. 



(PI. 170, fig. 2). 

 Melphidippa borealis, Boeck, Crust, amphip. bor. & arctica, p. 139. 



Bod}^ of tlie usual slender form, but having the segments of metasome 

 only very slightly produced dorsally, posterior edge of the last 2 segments 

 distinctly dentated, that of the 2 anterior segments of urosome likewise 

 dentated, but scarcely forming any distinct spiniform projection. Cephalon 

 having the lateral corners broadly rounded Coxal plates of the usual 

 appearance. Epimeral plates of metasome smooth, those of last segment 

 scarcely produced at the lateral corners. Eyes comparatively small, rounded, 

 with only a few slightly-developed visual elements, pigment red, with a 

 whitish coating. Superior antennse not nearly attaining the length of the 

 body, 2nd joint of the peduncle longer than the 1st, 3rd joint about half 

 the length of the former, flagellum twice the length of the peduncle, and 

 composed of about 19 articulations, accessory appendage rather fully deve- 

 loped, considerably exceeding in length the last peduncular joint, and composed 

 of 5 articulations. Inferior antennae scarcely shorter than the superior, the 

 last 2 joints of the peduncle nearly equal-sized, flagelhim half the length of 

 the peduncle, and 4-articulate. Anterior gnathopoda about as in the 2 

 preceding species. Posterior gnathopoda with the carpus but little expanded, 

 propodos rather large, fully as long as the carpus, and oblong oval in form 

 with the palm very short, and the dactylus small. The 2 anterior pairs of 

 pereiopoda having the carpal joint longer than the propodal one, and aboiit 

 equalling in length the meral joint. The 3 posterior pairs nearly as in the 

 2 preceding species. Last pair of uropoda about twice the lengtli of the 

 urosome, and of the iisual structure. Telson very narrow, nearly o times as 

 long as it is broad at the base, and gradually tapering distally, lateral edges 

 smooth, cleft extending beyond the middle, terminal lobes unequally bidentate, 

 and each carrying a slender, laterally-pointing spine. Body whitish, banded 

 transvei'sely with broad chestnut-brown patches; ova in the marsupial pouch 

 dark bluish. Length of adult female 7 mm. 



Bemarlcs. — The present species, established by Boeck, is easily 

 distinguishable from the 2 preceding ones by the far less strong armature 

 of the body, the rather fully-developed accessory appendage of the superior 

 antennse, and by the structure of the posterior gnathopoda. 



Occurrence. — Though nowhere in any abundance, this species is met 

 with along the whole coast of Norway, from the Christianiafjord to Vadso, 



