58 THE VOYAGE OF H.M.S. CHALLENGER. 



slender and elongate, almost t^^^ce as long as the body, the middle joint being much the 

 largest, and furnished on both edges with slender bristles. The last joint is rather small, 

 scarcely attaining one-third of the length of the middle joint, and having the distal part 

 of the inner edge sliafhtly emarginate, and armed with a dense row of bi-artifnlate 

 spinules, and likemse with a series of simple bristles. 



The first pair of maxillae (fig. 9) are rather small, without any trace of a palp or an 

 exognath. Of the two masticatory lobes, the outer is much the stronger, and is armed 

 at the abruptly truncated tip with a double row of strong spines (fig. 10). The inner 

 lobe is exceedingly small, triangular, and furnished with a single apical seta, as also a few 

 very small bristles on the outer margin. 



The second pair of maxillae (fig. 1 1 ) are decidedly membranous throughout, exhibiting 

 a structure most resembling that in Lophogaster. As in that genus, the palp is very 

 small, although distinctly bi-articulate. The masticatory lobes are unusually shoxi:, and, 

 as is also the case with the outer joint of the palp, provided with but a few simple bristles. 

 The outer lobe is slightly bifurcate at the apex. The exognath is very large, elliptical, 

 and fringed with a dense row of very strong, })lumose setae. No projection could be 

 observed at the outer side of the basal part. 



The maxillipeds (fig. 12) exhibit on the whole a structure very similar to that in 

 Lophogaster, but appear somewhat more meml)ranous. The basal part is rather broad, 

 and filled up with the strong muscles giving movement to the epipodite. The five-jointed, 

 incurving terminal portion, or palp, is scarcely as long as the basal part, and setose on 

 both margins. Its last joint (dactylus) terminates in a strong spine, and is provided, 

 at the inner edge, with three smaller spines, and also a few short bristles. The exopodite 

 is rather small, and has the form of a simple, narrow plate, fringed with plumose 

 .setse. The epipodite, on the other hand, is enormou.sly developed, lanceolate in form, 

 and of a very soft and almost spongy structure. 



The legs, as stated above, exhibit a very peculiar structure, and are, contrary to what 

 is observed in other Schizopods, rather dis.similar in appearance. All, however, having 

 powerfully developed natatory branches, or exopods, point out their schizopodous 

 nature. 



The three anterior pairs of legs (see PI. IX. figs. 13, 15, 17) are rather short and 

 powerful in structure, generally inclining toward the oral parts, and from this feature 

 they would seem to be endowed with tlie function of true gnathopoda. They increase 

 somewhat in length posteriorly (see fig. 1), the anterior pAir, corresponding to the 

 gnathopoda in other Schizopoda, being less powerfully developed and more membranous 

 in structure than the two remaining pairs ; they are also furnished with longer bristles. 

 In all of them the basal joint is somewhat produced, transversely oval, constituting with 

 the remaining part of the leg a strong elbow-shaped curve. The carpal joint is rather 

 elongate, and furnished in the two anterior pairs (figs. 13, 1.5), at the distal part of the 



