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



Very few specimens only were seen, and I am not quite certain as to the sex of some 

 of these. The mandible, I think, was present in all the specimens I have examined, 

 and if so the species will probably have to be referred to some other genus than Euchceta, 

 seeing that in one example a fifth pair of feet (fig. 5), apparently those of an immature 

 male, was observed. The structure of the swimming feet, however, as well as of the other 

 mouth-organs agrees entirely with the normal Euchceta. 



7. Euchceta barbata, n. sp. (PL XXII. figs. 6-12). 



Length, l-3rd of an inch (8 '4 mm.). Female. — Anterior antennae very slender (fig. 6), 

 twenty-three-jointed (?), the fourth, eighth, ninth, and thirteenth joints each bearing an 

 extremely long seta, the seventeenth and twenty- third joints having setae of moderate 

 length. The rostrum (fig. 7) and the posterior ventral angle of the thorax (fig. 12) have 

 beard -like tufts of setae, and so also has the last joint of the abdomen. The longer setae 

 of the first pair of foot-jaws (figs. 8-10) are ringed and densely pectinated, while the 

 processes which bear the shorter (proximal) setae are clothed with fine hairs (fig. 9). 

 The feet are constructed exactly as in the normal Euchceta, but the terminal spines 

 are extremely slender (fig. 11) and very finely serrated. Abdomen moderately long 

 (fig. 12), four-jointed, the first joint very large and angularly protuberant in front; 

 caudal setae subequal, densely setose, about as long as the abdomen. 



Habitat.— -Lat. 36° 44' S., long. 46° 16' W., down to 2650 fathoms (Station 325). 

 This fine species, of which only one example was seen, is sufficiently distinguished from 

 all others by the beard-like appendages of the forehead and thorax, the armature of the 

 first foot-jaw, the very slender apical spines of the swimming feet, and by the charac- 

 ters of the anterior antennae. 



Candace, Dana. 



Candacia, Dana, Amer. Journ. Sci., 1846. 



Ifionyx, Kroyer, Nat. Tidskr., 1849. 



Candace, Dana, Crust. U. S. Expl. Exped., 1852. 



Head consolidated with the first thoracic segment. Anterior antennae twenty-three- 

 or twenty-four-jointed, that of the male on the right side geniculated, and having the 

 median joints only slightly swollen. Posterior antennae stout, main stem composed 

 of a large base and a small bilobed apical joint, secondary branch two-jointed, first joint 

 almost obsolete. Mandibles twisted, narrow, ending in two stout teeth, the palp 

 very much expanded. Maxilla bearing a long styliform process, masticatory portion 

 sub triangular. First pair of foot-jaws very large and having long uncinate setae, 

 second pair very small, seven -jointed. Inner branches of the swimming feet two-jointed. 



