489 



scattered fascicles of slender bristles, dactylus extremely small. The 3 

 posterior pairs of pereiopoda much coarser than the 2 anterior ones, though 

 rather slender and elongated, and are generally strongly reflexed. Last pair 

 of uropoda about the length of the iirosome and the last segment of meta- 

 some combined, basal part rather broad and laminar, rami a little longer 

 than the latter, and subequal, both edged with slender spines. Telson 

 oblong triangular in form, with a number of small hair-like spines on each 

 side, cleft extending far beyond the middle, terminal lobes unequally 

 bidentate at the tip, and each carrying a slender apical spine. Body but 

 little pellucid, and of a brick-red colour, more or less mottled with 

 an opaque whitish pigment. Length of adult female scarcely attaining 

 6 mm, of male about the same. 



Remarks. - As above stated, this form was first announced by the 

 Rev. Mr. Norman as a species of the genus Atylus, and was subsequently 

 more closely examined by Boeck, and described under another name, viz. 

 Melphidippa longipes. It is a very distinct and easily recognizable form, 

 on account of its extremely slender and brittle appendages, and its opaque, 

 brick-red body. 



Occurrence. > Along the whole south and west coasts of Norway this 

 form is rather frequently met with, in moderate depths, varying from 6 to 30 

 fathoms. Owing to the great brittleness of the appendages, it is rather 

 seldom that a specimen is taken quite uninjured. The last pair of uropoda 

 especially are very easily detached from the body. 



Distribution. Shetland Isles (Norman), Kattegat (Meinert). 



Gen. 3. Amathilla, Sp. Bate, 1863. 

 Syu. : Arnathia, Rathke. 



Body rather strongly built, with the segments more or less elevated 

 dorsally. Cephalon comparatively small, with a slight rostral projection, 

 lateral corners distinct. Coxal plates of moderate size, 4th pair the largest, 

 and somewhat emarginated posteriorly in their upper part. Eyes well 

 developed. Antennae rather strong, subequal, with the flagella composed of 

 numerous short articulations, each encircled by a dense wreath of sensory 

 hairs; the superior ones provided with a well-developed accessory appendage. 

 Antennae in male somewhat more elongated, and having the opposite edges 

 of the peduncles densely clothed with tufts of sensory hairs, flagella of both 



04 Crustacea. 



