COPEPODA. 
23 
6. S. LONGIPES. 
S. longipes , Giesbrechfc, ‘ Belgica ’ Rep., p. 20. 
Cephalothorax symmetrical ; genital segment swollen laterally ancl roughly 
triangular-shaped, anterior antennse not reaching end of thorax, no spines on genital 
segment; fifth feet in 9 last segment elongated, curved (foliate), with external spine 
half as long as in $ ; right foot with two middle segments very elongated, ending 
distally in curved hook not articulating ; left foot without tumefied segment, two 
middle elongated, last shorter with knob and spine, but no processes. Size '8-'9 m. 
(Antarctic). (‘Discovery’ and ‘Gauss’ collections. Wolfenden.) 
7. S. ANTARCTICUM. 
Robust, cephalothorax a little unsymmetrical, right side prolonged; genital segment 
swollen laterally, with bunch of spine-like bristles each side ; furca as broad as long; 
anterior antennae reach to Ab. 2 ; Re of posterior antennse longer than Ri. Fifth feet 
in 9 right side longest, each with three end spines, innermost hook-like; in $, 
right with third joint elongated and club-shaped distally, with a large, roughly 
triangular plate, and last joint a strong, curved hook ; left foot, no tumefied segment, 
and last joint with distally a short-stalked haired knob, no appendages. Size = L75-2 
mm. (‘Discovery’ collection.) 
Stephus longipes. 
(Plate V., figs. 1, 2, 3.) 
Stephus longipes , Giesbrecht. ‘ Belgica ’ Rep., p. 20. 
? '75-‘80 mm. 6 ‘65-70 mm. Cephalothorax rather more than twice as long as 
the abdomen; head separated from first thoracic segment, but all segments very 
difficult to determine, owing to the indistinctness of the lines. Last thoracic segment 
with rounded margins and symmetrical. Abdomen in the female four, in the male five 
segments, furcal segments only as long as the anal, as broad as long, and with rounded 
margins, each with four tail bristles and a short fifth inner marginal bristle. Genital 
segment in the female as long as the next two, laterally with roughly triangular 
swellings, and in its greatest breadth, broader than long. Anterior antennse not as 
long as the thorax, and of twenty-three joints, the first, second, eighth and ninth 
coalesced, with few bristles, the longest on the seventh and eighteenth joints, but well 
supplied with long sesthe tasks. 
Posterior antennse with exopcdite about one-third longer than the endopodite. 
Posterior foot-jaw with rather thick first basal and B 1 : B 2 : Ri as 8 : 7 : 6 ; mandibles 
with broad-ended masticatory plate, one pointed outer tooth, with considerable space 
between it and the middle stout comparatively broad teeth, and three pointed inner 
teeth. 
