135 
branch. The maxilla normal, with smooth basal joint. The maxillipeds scarcely of medium 
length; the basal joint pretty robust, naked; second and third joints coalescent; the last 
joint with a spine inside the point. The sub-median skeleton much as in S. Holbélli. On 
each of the lateral borders of the head we find an area — more narrow towards the front 
and broad posteriorly —, which is closely covered with exceedingly short and fine hairs. 
The trunk is naked; trunk-legs are found. The genital area (fig. 3f) is much narrower 
than the head (fig. 3a), much broader than long; the solidly chitinised part forms a some- 
times narrow, sometimes tolerably broad semi-circle (in the latter case as in the following 
species, fig.4d), which opens broadly towards the front, with the foremost end of each side 
curved somewhat inward; the posterior margin is tolerably concave, and from the median 
part of the ring proceeds a considerable plate, which occupies the rather broad space be- 
tween the oblique, somewhat curved genital apertures, advancing somewhat beyond their 
anterior ends, and being cut off anteriorly by a straight line. The caudal stylets a little 
apart, situated on or closely behind the posterior margin of the solid chitine. The whole 
genital area is naked. 
MALE. It attains a length of about -21mm.; seen from below (fig. 3g), it is only 
about one sixth narrower than long, and seen laterally (fig. 3h), it is very thick; compared 
with the female, it is about middle-sized (comp. fig. 3c, fig. 3a and fig. 3b). The head scarcely 
as large as the trunk. The frontal border but feebly produced and naked. The antennule 
a little more slender than in the female, their sete a trifle longer. The antennze and the 
maxillule as in the female; the mouth-border proportionally broader than in the latter. The 
basal joint of the maxilla provided on its posterior side with a comparatively pretty long, 
oblique tap. The basal joint of the maxillipeds longer than in the female, with about three 
conical processes on the inner margin; on the distal part of the anterior side about three 
transverse stripes of ordinary hairs, on its proximal part two to four tiny, naked, transverse 
keels and a group of hairs at the base; the terminal joint with a couple of spines close inside 
the point. The sub-median skeleton with the two first pairs of processes distinct; the first 
pair small, the second pair long and parallel. From in front of the base of the antennula the 
lateral margin of the head is furnished with a line of hairs of medium length, which from the 
posterior end of the margin proceeds upward and forward in a slightly oblique direction 
across the side and the back. Behind this boundary, the back, the sides and the ventral 
surface of the trunk are closely covered with setaceous hairs of medium length; however, a 
careful examination shows that the trunk is covered with numerous small, somewhat oblong, 
transverse knots, from each of which proceed two or (more commonly) three hairs, the central 
one of which is the longest. (This arrangement, which is difficult to observe, is not repro- 
duced in fig. 3g and fig. 3h, as it was not discovered till after the plate was printed). 
However, on the back, far from the anterior boundary of the hair-covering, we find a short 
and not very broad, naked transverse area. The first pair of trunk-legs have a peduncle of 
medium breadth, a rather short inner branch and a little longer outer branch; each branch, 
