. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. LYSIANASSIDAE 73. Orchomenella acanthurus (Schell.) (Figs. 27 a, 31). Schellenberg, 1931, p. 47, fig. 25. Occurrence: 1. St. 141. South Georgia. 1 ovig. $ 10 mm. 2. St. 145. South Georgia. 1 ovig. $ 13 mm. 3. St. WS 33. South Georgia. 1 juv. 7 mm. 4. St. MS 62. South Georgia. 2 juv. 5-6 mm. Description. Body plump. Integument indurated. Head with antero-lateral angle quadrate. Eyes oval, wider below, black. Side-plates deep, one parallel-sided, rounded below, five nearly evenly bilobed, the post
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. LYSIANASSIDAE 73. Orchomenella acanthurus (Schell.) (Figs. 27 a, 31). Schellenberg, 1931, p. 47, fig. 25. Occurrence: 1. St. 141. South Georgia. 1 ovig. $ 10 mm. 2. St. 145. South Georgia. 1 ovig. $ 13 mm. 3. St. WS 33. South Georgia. 1 juv. 7 mm. 4. St. MS 62. South Georgia. 2 juv. 5-6 mm. Description. Body plump. Integument indurated. Head with antero-lateral angle quadrate. Eyes oval, wider below, black. Side-plates deep, one parallel-sided, rounded below, five nearly evenly bilobed, the posterior lobe only a little deeper than anterior, peraeopod 3 therefore freely movable outside the side-plate. Pleon segment 3 with dorsal profile less convex than usual, posteriorly subcarinate, and ending in a square, almost pointed, projection, postero- inferior angle quadrate; segment 4 with a high acute triangular process following the inden- tation. Telson ovate, scarcely half as long again a "â as wide, cleft for a little over half its length, lobes Fig- 31- Orchomenella acanthurus (Schell.). tapering to acute apices with a spinule in a notch a' ^rofile of ePistome and uPPer UP"*â¢Gnatho" .. - . , , pod 1, with palmar denticles further enlarged, on outside or apex, and three lateral spinules. c jelson Antenna 1, 1st joint stout, 2nd and 3rd short, flagellum 9-jointed, 1st joint long, accessory flagellum 6-jointed, 1st joint also long. Antenna 2 a little longer than antenna 1, flagellum 13-jointed. Epistome produced in a broadly rounded lobe projecting beyond the upper lip. Gnathopod 1, 6th joint distinctly narrowing distally, palm transverse, defined by two spines, its margin with minute squarish denticles, finger overlapping palm. Gnathopod 2, 6th joint minutely chelate. Second joint in peraeopod 3 broadly expanded, in peraeopod 4 less so, in peraeopod 5 again broadly expanded; hind margins of all feebly notched. Uropod 3, inner ramus extending to ape
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