135 



branch. The maxillae 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. Rolbolli. 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. 3 f ) 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 21 mm.; 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. 3 c, fig. 3 a and fig. 3 b). The head scarcely 

 as large as the trunk. The frontal border but feebly produced and naked. The antennulae 

 a little more slender than in the female, their setae a trifle longer. The antennae and the 

 maxillulae as in the female; the mouth-border proportionally broader than in the latter. The 

 basal joint of the maxillae 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. Prom 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. 3 g and fig. 3 h, 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, 



