120 ME. T. SCOTT ON ENTOMOSTE.ACA 



setse. Anterior foot-jaws rudimentary, 1-jointed, with a moderately stout terminal 

 claw and a small seta (fig. 23). Basal joint of posterior foot-jaws greatly dilated ; 

 second joint stout, bearing two marginal spiniform setae and armed with a strong curved 

 terminal claw, which is provided with a small seta near the base and on the inner 

 aspect. Swimming-feet nearly as in Lichomolgiis, both branches 3-jointed ; the setse on 

 their inner margins are stout and densely plumose ; the inner branches are considerably 

 lono-er than the outer (fig. 2\). Eifth pair rudimentary and provided with one small 

 marginal and two apical plumose setae. Abdomen short, composed of four segments ; 

 first segment large, the next three much shorter and narrower ; in the male the postero- 

 lateral angles of the first abdominal segment carry two plumose setse. Caudal stylets 

 about equal in length to the first abdominal segment ; apical setse three, and one on the 

 outer edge about one-third the length of the stylet from the proximal end. The 

 structure of the integument is shown in fig. 18. 



KaUtat. Station 9, in a tow-netting from 25 fathoms. Lat. 2' 34.' 9" N., long. 5' 22' 2" 

 E., 20 fathoms. Station 14, in two tow-net gatherings from 10 and 20 fathoms. 

 Lat. r 55' 5" N., long. 5° 55' 5" E., 20 fathoms, and lat. 0' 21' 1" N., long. T 0' 33" E., 

 20 fathoms. 



Though observed in these six separate tow-net gatherings, very few specimens were 

 obtained. 



Genus Lichomolgus, Thorell. 

 Lichomolgus, Thorell, Om Krustaceer i Ascidier, p. 74 (1859). 



LiCHOMOLGTJS CONGOENSIS, n. sp. (PL XIII. figs. 39-48.) 



Length fully 1 mm. Cei^halothorax moderately robust. Anterior antennae fully half 

 the length of the first cophalothoracic segment, 7-jointed, nearly as in Lichomolgus 

 fucicolus; the relative lengtlis of the joints are shown in the formula : — 



12 . 26 . 8 ■ 17 . 18 . 15 . 10 



12 3 4 5 6 7' 



Posterior antennae 4-jointed ; first, second, and fourth joints elongate, subequal ; third 

 joint very short and bearing two stout seta3 on the upper distal angle ; the last joint is 

 armed with two slender curved terminal spines and two setse ; there is also a small seta 

 on the inner margin near the apex (fig. 41). The mandible consists of a comparatively 

 broad and apparently abruptly bent process, the truncate apex of which is furnished 

 with a comb-like fringe of short setae ; a stout stylet-like appendage, finely crenate on 

 the upper edge, springs from the outer distal angle, and is closely applied to the 

 anterior edge of the ajipendage, and extends some distance beyond its fringed apex 

 (fig. 42). The maxillae are simple 1-jointcd appendages, bearing a few apical setae 

 (fig. 43). Eoot-jaws nearly as in Lichomolgus fucicolus, except that the posterior foot- 

 jaw is armed with a long curved spine on the inner margin of the proximal half of the 

 second joint (fig. 45). The four pairs of swimming-feet are also nearly as in Lichomolgus 

 fucicolus, except that there are stout dagger-shaped spines on the exterior margin and 



