. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. DESCRIPTION OF SPECIES 337. Fig. 14. Serolis orbiculata, n.sp., $: x lo. rostrum for the reception of the antennules, and behind the rostrum is a low transverse ridge extending to the lateral margins of the head. The eyes, which are oval or slightly reniform in shape and contain black pigment, are situated on raised areas towards the postero-lateral angles of the head; the area between the eyes is hollowed out and the lateral portions of the cepha- losome are smooth. The third and fourth (first

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. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. DESCRIPTION OF SPECIES 337. Fig. 14. Serolis orbiculata, n.sp., $: x lo. rostrum for the reception of the antennules, and behind the rostrum is a low transverse ridge extending to the lateral margins of the head. The eyes, which are oval or slightly reniform in shape and contain black pigment, are situated on raised areas towards the postero-lateral angles of the head; the area between the eyes is hollowed out and the lateral portions of the cepha- losome are smooth. The third and fourth (first two free) thoracic somites are sub-equal, the fifth not quite as long, the sixth about half the length of the third; the seventh is fused dorsally with the first abdominal segment for a considerable distance on either side of the middle line. The coxal plates are well developed, those of the first three free somites are separ- ated from them by sutures; those of the seventh somite extend backwards to about the middle of the protopodite of the uropod and just beyond the middle of the terminal segment: those of the male are very slightly longer than those of the female. The first three abdominal segments are broad, with a length equal to that of the fifth thoracic somite; the pleural plates of the second and third segments are short and do not extend beyond the anterior margin of the broad terminal segment. Each of the sternal plates of these segments has the median posterior border produced into a small spine, increasing in length from the first to the third. The terminal segment is triangular in shape, with the angles approximately equal and well rounded, and with the apex directed backwards; on its dorsal surface is an ill-defined median dorsal carina, on either side of which, placed at some distance from it, is a short lateral carina. This is made more conspicuous by the presence of a line of deeper pigmentation. The antennule is less than half the length of the antenna; it c