Urocopia singularis G. O. Sars. 7 
voluminous and strongly muscular basal part placed transversally 
to the axis of the body and slightly narrowed distally. To the 
end of this part is movably attached a much narrower and more 
highly chitinised terminal joint, which, like the masticatory part 
of the maxillæ, points inwards and forwards towards the mouth. 
It carries about in the middle a strong lateral spine coarsely 
spinulose at the edges, and terminates in another similar spine, 
which in addition to the usual spinulation has at the base outside 
-a strong denticle. 
The posterior maxillipeds (figs. 5 mp’, fig. 9), limiting 
the oral area behind, are more pronouncedly pediform than the 
anterior ones, and cunsist each of 3 well-defined joints, the Ist 
of which is the largest. The 2nd (propodal) joint is ovalin shape, 
and forms with the Ist a sharp elbow-like bend. It has inside, 
about in the middle, a small bristle, but is otherwise quite un- 
armed. The terminal (dactylar) joint is small and conically pointed, 
forming a short simple claw curving inwards. In all the known 
Lichomolgidæ these limbs are very differently developed in the 
two sexes. Whereas in the female they are rather small and 
apparently but little mobile, they are transformed in the male to 
very powerful prehensile organs, by the aid of which the female 
is got hold of during the copulation. No doubt a similar differ- 
ence will be found to exist also in the present form. 
The 4 pairs of natatory legs (see figs. 10—18) are all well 
developed, with the basal part very broad and flattened, carrying 
inside, at the end of the Ist segment, the usual densely ciliated 
seta. The rami are subequal in size and distinctly 3-articulate in 
all the pairs, the terminal joint being the largest and about equal 
in length to the other two combined. The spines clothing the 
outer ramus and partly also the inner, are remarkable by their 
large size and pronouncedly dagger-like shape, being bordered by 
a thin hyaline rim finely serrated at the edges. The outer ramus 
has in the 3 first pairs 6 such spines, 4 of them belonging to 
the terminal joint, whereas in the 4th pair (fig. 13) the proximal 
spine of this joint is absent. In all.the pairs the apical spine is 
much the largest and moreover differs in having oniy the outer 
edge sharpened and serrate, whereas the inner edge is thickened 
and densely clothed with cilia like those on the natatory sete. 
The inner ramus has in the Ist pair (fig. 10) only a single spine 
attached outside the terminal joint near the end. In the 2 suc- 
12 
