13 



posterior edges of the caudal segments, and the slender form of the distal joint 

 of the last pair of legs. It is moreover of much inferior "_size. 



Occurrence. This form is found rather abundantly along the whole south 

 and west coast of Norway, from the Christiania Fjord at least as far as the 

 Trondhjem Fjord. It generally occurs in a few fathoms' depth among algse, and 

 thus seems to be a more sub-littoral form than the other species of the genus. 



Distribution. Kieler Fohrde (Giesbrecht), Scottish coast (Scott), ? coast 

 of France (Canu). 



5. Longipedia rosea, G. 0. Sars, n. sp. 



(PI. V, fig-t3). 



Specific Characters. Female. Body less compressed than in the other 

 species and more abruptly attenuated behind ; integuments unusually thin and 

 pellucid. Rostral plate comparatively broader and more obtuse at the tip. Ge- 

 nital segment with the lateral denticles rather small; posterior edge of this and 

 the succeeding segments with only very slight traces of spinules. Anal opercle 

 with 3 very small denticles on each side near the base, terminal spine compara- 

 tively shorter than in the other species. Caudal rami short and thick, rounded at 

 the tip, each with an oblique series of small denticles dorsally; apical setae of 

 moderate length, and very conspicuously ciliated, especially the 2 middle ones. 

 Inner ramus of 2nd pair of legs comparatively shorter than in the other species, 

 inner proximal spine of last joint at about the same level as the outer spine. 

 Last pair of legs with the distal joint of about the same appearance as in 

 L. coronatd, proximal joint with the outer digitiform process comparatively short 

 and thick, inner expansion with a very small spinule inside the base of the ter- 

 minal seta. 



Body semipellucid, of a whitish colour, and variegated with irregular 

 patches of a bright rosy hue. 



Length of adult female 1.20 mm. 



Remarks. In the living state, this form is at once recognized from any 

 of the other species by its peculiar and beautiful colouring; but, as usual, this 

 character is lost in preserved specimens, which very soon assume a uniformly 

 whitish colour. On a closer examination, however, the present species may be 

 easily distinguished by the more slender form of the body, and especially by the 

 very distinct ciliation of the caudal setee, which, moreover, are not dark-coloured 

 as in the other species. 



