REPORT ON THE SCHIZOPODA. 117 



small aud quite smooth. The basal part of the flagellum is rather elongate, iu the female 

 about equalling the length of the scale, in the male (see PI. XXI. fig. 4) considerably 

 projecting beyond its apex, and having the last joint remarkably large and tumid. 



The anterior and posterior lips (PI. XX. figs. 8, 9) do not exhibit any marked 

 peculiarities of structure. 



The mandibles (fig. 10) are comparatively powerful, with the cutting edge (see fig. 11) 

 divided, as usual, into several sharp teeth, and exhibiting besides a well-marked molar 

 protuberance. The palp (see fig. 10) is remarkably slender and elongate, exceeding even 

 the body of the mandible in length, aud has the terminal joint nearly as long as the 

 medial, as also somewhat expanded towards the tip, and armed along the inner edge with 

 a row of ciliated bristles, which at the apex assume the character of strong curved spines. 



The first pair of maxillae (fig. 12) have the terminal joint, or palp, rather small and 

 narrow, whereas the exognath is very large and oval in form, with only a pair of minute 

 bristles at the anterior extremity. 



The second pair of maxillge (fig. 13) exhibit the usual structure, with the terminal 

 joint approximately triangular in shape. 



The maxillipeds (fig. 14) occur, as usual, quite pediform and very slender, with the 

 terminal joint (fig. 14a) linear and furnished along the inner edge with a row of small 

 ciliated bristles, besides a few longer sette. The epipodite forms a very small, narrow, 

 triangular lamella, affixed to the outer side of the coxal joint. 



The legs (see Pis. XX., XXI. fig. 1) are exceedingly slender and elongate, as also 

 densely setose, with the ischial joint longest. They increase somewhat in length as far as 

 the third pair, where they gradually diminish a little in size. On the first pair (fig. 15) 

 the terminal joint occurs but very slightly expanded, having, however, the usual bunch of 

 ciliated bristles near the tip (see fig. 15a). In this pair, as in the three succeeding (see 

 fig. 16), the terminal part, consisting of the three outer articulations, is much longer than 

 the meral joint, whereas in the antepenultimate pair (fig. 17) this part is much reduced in 

 size. On the other. hand, in this pair the ischial joint is very elongate, being twice as 

 long as the meral. The penultimate pair of legs (fig. 1.8) occur entirely without the 

 terminal part, the endopod being composed of only two joints, the last of which (meral) 

 scarcely attains half the length of the preceding. On both of the last mentioned pairs 

 the exopod is wholly wanting in the female, whereas in the male this part occurs 

 distinctly developed (see PI. XXI. fig. 5). The last pair of legs (PI. XX. figs. 19, 20) are 

 quite rudimentary, being in greater part completely hidden between the posterior gills ; 

 they constitute a small, somewhat flexuose naked stem springing from a somewhat 

 thickened basal part, and exhibiting an exceedingly soft consistence, similar to that of 

 the gill-stems. 



The gills increase, as usual, successively in size from before backwards, forming a 

 regular series along the sides of the trunk below the carapace. The six anterior pairs 



