_ 145 



iiai'i'owly I'dunded at the lateral corners, posterior edge slightl)- arched. Ej-es 

 imperfectly developed, consisting of an irregular mass of whitish pigment 

 without any trace of visual elements. Superior antennae with the 1st joint 

 of the peduncle about the length of the other 2 combined, Hagellum a little 

 shorter than the jieduncle, and consisting of (! articulations, accessoi')- apjien- 

 dage slightly' exceeding lialf the length of the tlagellum, and 4-articulate. 

 Inferior antennfp in female considerably longer than the superior, penultimate 

 joint of the peduncle rather large, oblong oval, with 3 tran.sverse rows of 

 spines, and a few slender and simple setae, tlagellum about the length of the 

 2 outer joints of the peduncle combined, and (5-articulate ; those of male nearly 

 attaining the length of the body, joints of the peduncle densely hair}- in front, 

 tlagellnni very slender, (jnatliopoda not very powerful, the postei'ior ones 

 only slightly larger than the anterior, hand in lioth oblong oval, somewhat 

 dilated distall)-, palmar edge shorter than the hind margin. Antepenultimate 

 pair of pereiopoda with the basal joint moderately expanded, and broadest 

 in its proximal pai't; penultimate pair about half the length of the body; 

 last pair \\ith the basal joint very large and broad, about as long as the 

 remaining ])art of the leg, posterior edge strongly curved and finely serrated. 

 Last pail' of uropoda in female with the inner ramus scarcely exceeding half 

 the length of the outer, mucroniform and quite naked; those in male with 

 the rami nearly equal-sized, narrow lanceolate and fringed with long ciliated 

 setsp. Lobes of telson rather nai'row and but slightly attenuated distally, 

 each with 2 .small spines and a little l)ristlp on the obtusely rounded tip. 

 Colour light buff, changing to (H'ange, with opaque whitish shadows. Length 

 of adulte female 7mm, of male about the same. 



Bemarks. — The above described species, the type of the genus as 

 iiere restricted, is easily known from the two Challenger species, as also from 

 that characterised by Dr. (Jhevreux, by the imperfectly developed eyes and 

 Ijy the less powerful gnatliopoda. The PJmxm Kriiyeri of Stimpson is un- 

 doubtedly this species. 



Occurrence. -- The species would seem to be a geniiine arctic form, 

 occurring in great abundance oif the coast of Finmark, thus at Vadso, in 

 depths varying from 20 to 50 fathoms, especially where the bottom is sandy. 

 Oif' the west coast of Norway, it is much more rarely met with, though 

 oc;curring as far south as Egersimd. 



Bistrihulion. — Arctic Ocean: (xreenland, Spitsbergen, Iceland, Jan 

 Mayen, Labrador; ea.st coast of North America ; British Isles, coast of Bohus- 

 lan, Kattegat, the Baltic; coast of France (Chevreux). 



Crustuuejt. 



