lilyriopoda of the ^ Challenger^ Expedition. L"53 



Head smooth, without frontal setae. Eyes obscurely mani- 

 fested, represented by a patch of black pigment. Antenme 

 short, scarcely surpassing the coUum. 



Collum laterally angular and marked with a few strife. 

 The first five segments smooth above, striate at the sides ; 

 the rest striate above and at the sideSj the striae not close-set 

 and not reaching the hinder border of the segments. The 

 sulcus complete and deep, crenulate, the area in front of it 

 smootii. The pores conspicuous, situated just behind the 

 sulcus, and, except at the liinder end of the body, touciiing it, 

 the sulcus being posteriorly angled to meet the pore. 



Anal teryite covering the summit of the valves, sometimes 

 just j^urpassing them ; valves convex, not compressed, and 

 scarcely hairy ; sternite triangular. 



Leys short. 



(J. Smaller and thinner than female. The first pair of 

 legs small and hook-like ; the second pair without coxal pro 

 cesses; the second segment of the mandible produced back- 

 wards into a large rounded prominence. 



Number of segments up to 44. 



Length up to 15 mi Him. 



Loc. Inaccessible Island and Tristan Island (Tristan 

 d'Acunha). 



lulus soh'tnriusj sp. n. 

 (PI. IX. fig. 4.) 



Colour very like that of /. pusillus of Leach ; two longitu- 

 dinal flavous dorsal bands, the median dorsal line and the 

 sides of the body black, the lower surface and legs flavous ; 

 antennas and space between the eyes fuscous. 



Head lightly punctulate, without distinct frontal pores. 

 Eyes well developed, subcircular, composed of at least five 

 distinct rows of well-defined ocelli. AntenncB a little longer 

 than in the preceding species. 



The collum laterally acutely triangular, margined, its ante- 

 rior border lightly sinuate ; the first three or four segments 

 smooth above, striate at the sides, the rest striate above and 

 below, the strise deep but not close-set and not reaching the 

 hinder border of the segments. The sulcus deep, the area 

 beiiind it raised, that in front of it smooth. Pores scarcely at 

 all cons])icuous, situated just behind the sulcus but touching 

 it, the sulcus lightly anteriorly angled. 



Anal teryite surpassing the valves a little, the process short 

 and down-curled ; valves convex, not compressed, and smooth ; 

 sternite acutely triangular and very long. 



