83 
The mandibles, one with a bidentate, the other with a uniden- 
tate apex, have the trunk about as long as the elongate first 
joint of the palp, which is more than twice as long as the still 
slenderer second joint. Kréyer says that the molar part is 
strikingly distinguished from that of S. Frisia (S. atlanticus, 
M.-Edw.) in not having a purple colour but a brown horn- 
colour. The South African specimen, however, is in this part 
conspicuously purple. 
In the second maxilla, Kroyer distinguishes this species 
from S. Frisit by the form of the exopod “which is much 
more elongate and narrow, especially forwards,’ and by 
the axe-like form and much stronger prominence of the first 
joint. As to the latter character, the lobe of the first joint 
in our specimen is not axe-like and it is contiguous to the 
divided lobe of the second joint, not separated as in Krdéyer’s 
figure. The first maxillipeds agree with Kréyer’s figure 
except that the epipod is not twisted ; both its ends are rounded, 
the upper much narrower than the lower. The other maxillipeds 
and the peraeopods appear to me to agree with the descriptions 
by Smith, Hansen and others. But as to the first peraeopods 
there is some difficulty, for Smith speaks of them as “ sub- 
chelate.” In contrast’ with the definitely though minutely 
chelate endings of the second and third pairs, one would expect 
the term “‘sub-chelate”’ to apply to some arrangement of 
the finger in application to the apex of the preceding joint. 
But the first peraeopods in this species have a termination 
which is quite straight, the sixth joint being sub-divided 
into fifteen articulations, followed by a minute joint, which 
may be taken to represent the finger. In this respect, there- 
fore, the limb would be called “simple,” but where the fifth 
and sixth joints meet there is a noteworthy arrangement of 
serrate spines giving a subapical fringe to the former; while 
from the emarginate base of the sixth joint shorter spines 
curve backwards to meet the longer spines of the fringe. It 
looks like an elaborate clasping arrangement. Being at the 
hinge of these elongate joints, instead of at their ap.ces, its 
grasping power must be very limited, and in this respect 
corresponds with that of the true chela in the two following 
pairs of limbs. Possibly the long delicate second antennae are 
passed between these sets of pectinate spines for cleaning. 
The same arrangement is found in S. prehenstlis, Bate, and 
is evidently alluded to in its specific name. Smith describes 
it in his S. vobustus, and Faxon in S. bisulcatus, Wood-Mason. 
It also occurs in the species next described. 
In the uropods the outer ramus is five times as long as its 
greatest breadth, with the outer margin smooth as far back 
