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broad; the solid chitine forms a somewhat irregularly shaped plate (fig. 1a), in which a 
tolerably large area of the anterior third part is thin-skinned and partly merging in the 
skin surrounding the plate (though in two dissected specimens the shape of the plate and of 
the membranous part were somewhat different, the present description will do for both). 
The genital apertures are seen far to the front on the posterior half of the plate; they are 
strongly curved and situated at a moderately long or rather short distance from each other, 
in such a position that their muscles turn very much sideways and a trifle forward. The 
space between the genital apertures has some longitudinal stripes of very short hairs; the 
remainder of the area is naked. At a short distance behind the apertures appear a couple 
of small cones, which doubtless are the rudimentary caudal stylets. 
MALE. A good-sized specimen is 55 mm. long and -42 mm. broad, which is large 
indeed, though, considering the proportion between the sexes in other species, it is but 
mniddle-sized (fig. 3b: fig. 3a) comparatively to the females, which are large. Seen from below, 
its shape is very characteristic, almost hexagonal, the posterior margin of the trunk forming 
a somewhat convex line, its lateral outline being moderately long and somewhat concave, 
whereas the head has a long, slightly curved, lateral outline and a very short anterior 
margin. The head nearly the size of the trunk. The frontal border strongly produced, 
with converging lateral margins; terminal margin short, cut off in a straight line, with a 
pretty deep incision in its median part, while distally each lateral margin has two deep and 
rather broad incisions and, somewhat in front of the antennula, a slight depression; these 
incisions form three pairs of lobes, the hindmost of which are low, the others good-sized with 
almost right angles; the terminal margin of all the lobes is furnished with a row of nume- 
rous minute processes. Antennule short, 2 jointed, with short sete. Antennz of scarcely 
medium size, 3-jointed, second joint the longest; terminal seta the length of the last joint. 
Mouth-border a little broader than in the female; maxillule as in the female. Mavxille 
(fig. 1b) nearly as in the female, and the two last joints coalescent as in the other sex. 
Maxillipeds of medium length, basal joint rather slender, otherwise this joint as well as the 
others constructed and equipped (fig. 3f and fig. 3h) as in the female. The sub-median 
skeleton has the two first pairs of processes, first pair about middle-sized, second pair power- 
ful, long and diverging slightly backward. The lateral border of the head has a peculiar 
shape, curving strongly towards the base of the maxillee, then turning backward and obliquely 
sideways almost at right angles; the margin fringed in the middle with moderately long 
hairs, anteriorly and posteriorly with long hairs, and from its hindmost end a narrow stripe 
of extremely long hairs runs upward across the side of the animal, where it curves slightly 
forward (fig. 3g), then continues across the back in an oblique line. Behind this stripe the 
back and sides, as well as the ventral surface of the trunk, are densely covered with mode- 
rately long, and in front of the second pair of legs, with long hairs. About the middle of 
the back of the trunk is seen a short and very narrow transverse area. First pair of trunk- 
legs pretty small, their basal part indistinctly defined, and from this part proceed two 
