1220 THE VOYAGE OF H.M.S. CHALLENGER. 



The First and Second Uropods biramous, the first extending much beyond the 

 second ; the Third Uropods small, uniramous. 



Telson doubtful, probably very small, undivided. 



The name of the genus is taken from Kerguelen Island, which the Challenger 

 Expedition has shown to be a locality of notable interest with regard to the Amphipoda. 

 From Boeck's definition of the Lysianassinse this genus differs in the formation of the 

 mandibles, the tenuity of the maxillipeds, the want of the brush on the first joint 

 of the flagellum of the upper antennas ; in not having the first joint of the third 

 peraeopods dilated, and in having the fifth peraeopods shorter instead of longer than 

 the fourth. But in the maxillipeds it agrees with the new genus Sophrosyne, next 

 to which for this reason I propose to place it ; it agrees with Menigrates obtusijrons, 

 Boeck, in the character of the upper antennas, so far as can be judged from Boeck's own 

 description and figure, and with the same genus in the relative length of the two last 

 pairs of peraeopods. From Acontiostoma, of which it is in respect to the gnathopods 

 and some other points suggestive, it is widely removed by the character of the 

 maxillipeds and the position of the mandibular palp. The general character of the 

 antennae, the peculiarities of the gnathopods, the shape of the deep side-plates, as 

 indeed of the whole animal, and the peraeopods, all clearly point to the inclusion of the 

 genus in the family Lysianassidae, although the structure of the mandibles must give it 

 rather the air of an intruder. 



Kerguelenia compacta, n. sp. (PI. XVa.). 



A compact little species, discovered among the Hyperina too late for the description 

 to be inserted in its proper place ; in outward appearance it resembles the Stenothoidas 

 even more than the Typhidae ; of the peraeon-segments the fifth is the longest and 

 deepest ; the third pleon-segment has the postero-lateral angles almost right angles, 

 the fourth pleon-segment is elongate, as long as the third ; the fifth is very short, the 

 sixth narrow, longer than the fifth. Colour of the specimens preserved in spirits, a 

 light brown. 



Eyes not perceived, but not certainly absent. 



Upper Antennas. — The first joint thick, not much longer than broad, carrying three 

 feathered cilia ; the second joint rather longer than broad, much narrower and shorter 

 than the first, carrying one feathered cilium ; the third joint shoi'ter and narrower than 

 the second ; the flagellum of five little joints, successively narrower, together not so 

 long as the first joint of the peduncle, the second with an apical filamentary cylinder, 

 the last with some minute setules ; the secondary flagellum consisting of three joints, 

 which are rather longer than the first three of the primary. 



Lower Antenna}. — The first joint a little expanded, closely coalesced with the second, 



