. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. AMPELISCIDAE 89 Description. Integument smooth, shiny. Head dorsally keeled, but not sharply. Peraeon dorsally rounded, only on the 7th segment with a very faint indication of the dorsal ridge, which becomes distinct on pleon segments 1-3, especially on 3. In the specimens from no. 1 large <S3 are distinctly keeled from peraeon segment 5 to pleon segment 4. Pleon segment 4 with indistinct ridge, but ending in a small point. In young specimens there are 2-3 minute setules on posterior margins
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. AMPELISCIDAE 89 Description. Integument smooth, shiny. Head dorsally keeled, but not sharply. Peraeon dorsally rounded, only on the 7th segment with a very faint indication of the dorsal ridge, which becomes distinct on pleon segments 1-3, especially on 3. In the specimens from no. 1 large <S3 are distinctly keeled from peraeon segment 5 to pleon segment 4. Pleon segment 4 with indistinct ridge, but ending in a small point. In young specimens there are 2-3 minute setules on posterior margins of pleon segments 2-4, which get rubbed off in larger specimens. Head with short deflexed rostrum. Corneal lenses 4, the lower pair situate within the lower margin of head, immediately behind bases of 1st antennae, and thus invisible in lateral view. Side-plates 1-3 narrow, 1 pro- duced forwards, 3 shallower than 2. Side-plate 4 much shallower than 1-3, longer than deep, posteriorly produced into a subacute point. Lower margins of 1-4 setose. Side- plates 5-7 successively shallower, 6 and 7 with a few setae on anterior lobes. Postero- inferior angle of pleon segments 1 and 2 rounded, with a few setae, of segment 3. Fig. 42. Haploops securiger, Brnrd. a. General view. b. Palp of mandible. broadly rounded, non-setose. Telson ovate, cleft for three-quarters of its length, lobes contiguous, a single dorsal spinule on each lobe in distal half, and one at apex. Antenna 1, 2nd joint i\ times 1st, 3rd short, flagellum reaching to about middle of peraeon. Antenna 2, 5th joint shorter than 4th, flagellum reaching to about end of peraeon. Mandibular palp with 2nd joint slender, nearly linear, 3rd two-thirds as long as 2nd. Gnathopod 1, 6th joint nearly as long as 5th. Peraeopods 1 and 2, dactyl subequal to 6th joint, peraeopod 2 strongly setose on hind margin. Peraeopod 3, 2nd joint obliquely oval, anterior margin evenly convex, with plumose setae, hind margin proximally lobed, the distal
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Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti
