1886.] DURING THE VOYAGE OF H.M.S. 'CHALLENGER.' 10.5 



Genus Janira, Leach. 



1. Janira ABYSSicoLA, n. sp. 



The present species is represented by a single female example, 

 dredged off Fiji in very deep water. 



The head has a rounded anterior margin ; the eyes are completely 

 absent. The first three segments of the thorax are of about equal 

 length ; the next two segments are much shorter, beinu; about one half 

 the length of the anterior segments; the sixth segment has an 

 antero-posterior diameter about equal to that of either of the anterior 

 segments, while the seventh segment is loriger than any. The 

 antenna: are longer than the body of the animal ; the flagellum is 

 much longer than the peduncle. The mandibles liave a palp. The 

 thoracic limbs are all sirnilar to one another. The uropoda are as 

 long as the abdominal shield ; they are biramose ; the endopodite is 

 stouter and longer than the exopodite. 



Station, 1350 fathoms. 



2. Janira tristant, n. sp. 



The head is broader than long, with very large, laterally placed 

 eyes ; it is prolonged into a long stout rostrum with a rounded 

 extremity. The first two segments are of about equal length ; the 

 three succeeding segments progressively diminish in lengtli ; the 

 last two are again somewhat longer. The abdominal shield is sub- 

 pentagonal and terminates in a short blunt process. The antenmdes 

 have a long flagellum ; the peduncle is composed of four joints, all of 

 which are short. The mandible has a three-jointed palp. The 

 thoracic appendages are all similar to each other. 



Off Tristan da Cunha, 100-150 fathoms. 



Genus Jceropsis, Kohler. 



1. Jceropsis MARION IS, n. sp. 



The only previously known species of this genus was described by 

 M. Kohler, from the island of Sark ; the present species was 

 dredged oif Marion Island in 100 fathoms. The single specimen 

 measures 4 rnillim. in length. 



The head is roughly quadrangular in outline ; the anterior margin 

 is prolonged between the antennae into a rostrum, which is deeply 

 notched at the extremity ; the eyes are of fair size, and dorsal in 

 position ; the lateral margins of the head are serrated. The head is 

 about as long as the first two segments of the thorax taken together ; 

 the latter are subequal, the third is slightly shorter, the fourth and 

 fifth subequal and very much shorter again ; the last two segments 

 are quite as long as the two first ; the segments are separated by deep 

 lateral incisions ; the lateral margins of the segments are feebly 

 serrated. The abdominal shield is somewhat triangular in outline, 

 and terminates posteriorly in a three-jointed process ; in the two 

 notches separating these processes lie the uropoda ; the lateral 

 margins are serrate. The antennules are very short ; the flagellum 



