REPORT OX THE SCHTZOPODA. 57 



the last segment is very luudi compressed, as also exceedingly elongate, equalling in length 

 the three preceding segments taken together. 



The eyes (see PL TX. fig. 3) in the female are very small, and nearly cylindrical, 

 with the cornea not in the least ex])anded, and are furnished with a whitish pigment. 

 The visual elements would also seem to be most imperfectly developed. In the male (see 

 PI. X. fig. 13) the eyes are rather larger and thicker, with a darker pigment, l)ut here, 

 too, the visual elements do not exhibit any complete development. Both in the male and 

 the female a distinctly marked ocular papilla is seen projecting anteriorly over the upper 

 part of each cornea. The ocular segment projects anteriorly as a broadly rounded lobe, 

 reaching a trifle Ijeyond the insertion of the eyes (see PI. IX. fig. 3). 



The antennular peduncle (see PI. IX. fig. 3) is rather stout, and somewhat flattened 

 throughout. Its basal joint is almost as large as the two other joints taken together, and 

 finely setiferous along the inner edge, as also partly on the upper face ; its outer edge 

 exhibits a few (three) somewhat stronger plumose bristles, and terminates in an almost 

 perfect right angle, from which proceed a Inmdle of similar Inistles. The second joint is 

 rather short, and connected with the last by a very oblique suture, running from ^\'ithout 

 inwards. The last joint has the inner edge sharjiened and projecting anteriorly as a trian- 

 gular lobe, with a fringe of dense and very long plumose bristles, carried along the whole 

 of the inner margin. The inner flagellum is very small, only slightly exceeding the 

 peduncle in length. The outer, on the contrary, is most powerfully developed, equalling, 

 it may be, the whole body in length. In none of the specimens, however, is the outer 

 flagellum quite complete, a more or less consideralile portion being invariably l)roken ofi". 



The antennal scale (see PI. IX. fig. 4) is rather large, projecting fiir beyond the 

 antennular peduncle, and in form is somewhat oblong-ovate, slightly tapering toward the 

 apex. The outer edge is a trifle arched in its proximal part, and terminates in a very 

 small dentiform projection ; the inner edge is very slightl}' arcuate, and the apex forms a 

 broadlj^ rounded lobe, marked off from the remaining part of the scale by a distinct oblic[ue 

 suture, and fringed with a dense i-ow of long bristles, carried along the entire inner edge 

 of the scale. The flagellum is strongly developed, the basal part consisting as usual 

 of three joints, — the last by far the largest, — and the terminal part, according to the 

 statement of the late Dr. v. Willemoes-Suhm, even exceeding the whole of the body 

 in length. 



The anterior lip (see PI. IX. fig. 5) forms a rounded triangular prominence, somewhat 

 narrower than the same part in Gnatho2ohausia. 



The posterior lip (fig. 8) has the lateral lobes somewhat expanded and in-egularly 

 rounded off, their inner edges lieing finelj' ciliated. 



The mandibles (see fig. 5) exhibit, in respect of their bod\', a structure very similar to 

 that in the Lophogastridse, the cutting edge being irregularly and coareely dentate, and 

 exhibiting, moreover, a small molar area posteriorly. The palp, on the other hand, is verj' 



(ZOOL. CHALL. E.XP. — PART XX.KVII. — 1885.) Oo 8 



