265 



furnished witli one outer marginal seta, four apical setae, and one inner marginal seta (Plate 

 LXVII, fig. 6). 



The antennules are moderately long and seven-jointed. The second joint is longer than 

 any of the others. The third and seventh joints are of nearly equal length (Plate LXVII, fig. 7). 



The antennae are comparatively short and four-jointed. The fourth joint is furnished at 

 the apex with one stout claw and three short setae (Plate LXVII, fig. 8). 



The mandible has a stylet-shaped apex. The outer portion of the apical region is some- 

 what quadrangular in shape. The outer margin is furnished with a strong triangular tooth-like 

 process. The inner margin is fringed with fine short hairs. The upper surface has a simple 

 hyaline edge (Plate LXVII, fig. 9A). 



The maxillae are rather narrow and the apex is furnished with three setae (Plate LXVII, 

 fig. qB). 



The apical portion of the first pair of maxillipedes is stylet-shaped. The middle portion 

 of the upper margin is fringed with fine spines. The inner margin is furnished near the base 

 with a short stout spine (Plate LXVII, fig. 10). 



The second pair of maxillipedes is prehensile and three-jointed. The third joint is short 

 and narrow. The apex is furnished with two moderately stout spines (Plate LXVII, fig. 11). 



The exopodites and endopodites of the first three pairs of feet are three-jointed. The 

 exopodite of the fourth pair of feet is three-jointed. The endopodite is two-jointed. 



The fifth pair of feet is comparatively large. The distal end is rather narrow and is 

 furnished with one moderately long seta (Plate LXVII, fig. 16). 



Male — length .67 mm. 



The male resembles the female in general appearance, but the abdomen is composed 

 of five segments and the genital segment is very large and inflated. The second pair oi 

 maxillipedes is well developed and is prehensile. The terminal claw is long and slightly curved 

 (Plate LXVII, fig. 12). The endopodite of the first pair of feet is apparently to some extent 

 prehensile. The second joint is curved, and there is an indication of a hinge between the 

 second and third joints (Plate LXVII, fig. 14). The fifth pair of feet is smaller than in the female. 



This species can readily be recognised by its small size and rounded body, by the very 

 short furcal joints, and by the shape of the fifth pair of feet. The structure of the endopodite 

 of the first pair of feet of the male is quite distinct from what is usually found in the males 

 of this genus. 



Occurrence. — Seven females and two males were found in the washings from dredged 

 invertebrata collected at Station 226, midway between the Lucipara and Schildpad Islands, 

 from a depth of 1595 metres. 



5. Lichomolgus gracilipes nov. sp. Plate LXVIII, figs. 11 — 20. 



Female — length 1,53 mm. 



Seen from above, the body appears broadly oval in outline. The cephalic segment is 

 greatly inflated near the middle. The frontal margin is boldly rounded. The fourth thoracic 



SIBOGA-EXPEDIT1E XXIX a. 34 



