1116 THE VOYAGE OF H.M.S. CHALLENGES. 



Amphithoe kergueleni, n. sp. (PI. CXVIL). 



Rostrum inconspicuous, lateral lobes of the head not very prominent, with rather 

 irregular outline ; the postero-lateral angles of the first three pleon-segments almost 

 squared. The animal in many parts covered with dark stellate markings. 



Eyes rounded oval, situated on the lateral lobes of the head close to the margin. 



Upper Antennae. — First joint rather thick, about as long as the head, with some 

 spinules on the under margin, and at the apex a group of small stiff spines and longer 

 slender ones ; the second joint much narrower but longer than the first, slightly bent, 

 with spinules along the margins, and some slender spines on the lower one ; the third 

 joint more than a third the length of the second, similarly armed ; the flagellum much 

 longer than the peduncle, with thirty-three slender joints, tipped with setiform spines, 

 alternately longer and shorter on the upper joints. 



Lower Antennas shorter than the upper. First two joints very short, gland-cone 

 small, acute, decurrent; third joint short and broad, longer than the preceding two 

 united, with some spinules on the margin, and a large group of setiform spines on the 

 lower apex ; the fourth joint abruptly narrower, about as long as the first joint of 

 the upper antennas, slightly bent, with setiform spines at four or five points of each 

 margin ; the fifth joint similar, a little shorter and narrower ; the flagellum of twenty 

 joints ecpiipped as in the upper antennas, and the last joint being, as in that pair, 

 minute. 



Upper Lip. — The centre of the distal margin rounded, prominent, the cilia there 

 being straight, spine-like, projecting ; the cilia on either side long, directed towards the 

 centre ; the margins between the rounded sides and rounded centre of the plate being 

 nearly straight. 



Mandibles. — The cutting edge divided into eight strong teeth ; the secondary plate 

 into five or six on the left mandible, and on the right mandible into four that are 

 alternately long and short ; the spine-row consisting of nine long bent spines, denticulate 

 prominently on the outer convex side ; the inner spines longer than the outer ; the molar 

 tubercle prominent, with long teeth round the crown of it, and a long plumose seta, two 

 of the teeth by its side on the right mandible being almost setiform in their length ; 

 there is a process near the base of the palp ; the first joint of the palp rather longer than 

 broad ; the second joint not very long, with spines at three points of its front margin ; 

 the third joint rather longer and broader than the second, with about fourteen long 

 pectinate spines, of which four or five may be reckoned to the front margin, the rest are 

 crowded round the apical curve, those at the extreme apex being the longest ; the outer 

 margin is a little convex, without spines. 



Lower Lip. — The principal lobes narrow, finely ciliated on the outer margins, with a 

 little conical process at the inner apex, the inner margin deeply sinuous, ciliated on the 



