306 6. 0. SARS, (sam 
on the inner edge. The carpal joint is nearly twice as long and much narrower, 
with both edges setiferous. The prododal joint is very small and only pro- 
vided with a single spiniform seta at the inner corner. Finally, the dactylar 
joint is about twice as long as the propodal one, and tapers somewhat dis- 
tally; it is provided at the tip with several somewhat diverging stiff bristles. 
The exopodite exhibits the usual structure, and has 3 plumose sete on the 
outer edge of the basal part. 
The 3 posterior pairs of legs represent the true walking legs or pereio- 
poda, and are much more freely mobile than the 2 anterior pairs, being 
also generally more spread at the sides (see fig. 1). They successively decrease 
in length, and exhibit on the whole a rather uniform structure. In all of them 
the basal joint is comparatively narrow, cylindric, but of very different size, 
being in the 3rd pair (fig. 15) rather large, nearly twice as long as the 
remaining part of the leg, whereas in the last pair (fig. 16) it is so much 
shortened as scarcely to exceed half the length of that part. It carries a 
number of plumose setze, and in addition, on the 3rd and 4th pairs, a small 
biarticulate appendage affixed to the outer side, at some distance from the 
base, and carrying 2 plumose sete. This appendage, which is constantly 
present in all the species, and also occurs in 4 other Cumacean genera, viz., 
Cumopsis, Lamprops, Hemilamprops and Paralamprops, must undoubtedly 
be regarded as a rudiment of an exopodite. The terminal part of these legs 
is more or less curved, and rather richly supplied with slender bristles, those 
issuing from the end of the carpal joint being peculiarly modified, terminating 
with a closely annulated lash. The propodal joint is very small, and carries 
at the end outside a similar bristle. The dactylar joint is still smaller, and 
not easy to distinguish from the slender curved spine in which it terminates. 
The incubatory pouch or marsupium, projecting below the anterior divi- 
sion of the body (see fig. 2), is, as in other Cumacea, composed of 4 pairs 
of large lamellæ issuing from the base of the posterior gnathopoda, and the 
3 anterior pairs of legs. These lamellæ overlap each other both at the sides 
and at the tip, thus forming together a completely closed, roomy cavity, in 
which the ova undergo their development. 
The uropoda (fig. 17), which are movably articulated to the end of the 
last segment, and more or less diverge to each side (see fig. 1), are very 
slender and elongated, exceeding even half the length of the metasome. 
They are each composed of a narrow cylindrical scape and 2 terminal rami. 
The scape is much longer than the rami, and is edged inside with about 8 
sete, the 4 anterior of which are placed more apart than the 4 posterior 
ones. The inner ramus is uniarticulate, and of a narrow mucroniform shape, 
terminating in a sharp spine, which is not distinctly defined from the ramus. 
Mélanges biologiques. Τ. XIII, p. 470. 
