306 G. 0. SARS, [X. S.IT 



on the inner edge. Tlie carpal joint is nearly twice as long and much narrower, 

 with both edges setiferous. Tlie prododal Joint is very small and only pm- 

 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 e.xopodite exhibits the usual structure, and has 3 plumose seta) 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 tig. 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 (flg. 16) it is so much 

 shortened as scarcely to exceed half the length of that part. It carries a 

 number of plumose setie, 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 setaj. This appendage, which is constantly 

 present in all the species, and also occurs in 4 other Cumacean genera, viz., 

 Gumopsis, Lamprojjs, 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, pi'ojecting below the anterior divi- 

 sion of the body (see fig. 2), is, as in other Cumacea, composed of 4 pairs 

 of large lamelke issuing from the base of the posterior gnathopoda, and the 

 3 anterior pairs of legs. These lamella' 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 raovably 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 

 seta:;, 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 lanuis. 



Melanges biologif|nes. T. XIII, p. 470 



