. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. TIRONIDAE 149 carina produced posteriorly into a tooth, which increases in size posteriorly, that on segment 5 being the largest; segment 6 feebly carinate, ending in a very small median tooth at base of telson. Postero-inferior angle of pleon segment 3 quadrate, with a very slightly produced point; a few widely-spaced setules on hind margin above the angle. Telson with a minute setule in a notch on apex of each lobe, and four to five setules on upper surface. Antenna 1, flagellum 10-jointed, ac
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. TIRONIDAE 149 carina produced posteriorly into a tooth, which increases in size posteriorly, that on segment 5 being the largest; segment 6 feebly carinate, ending in a very small median tooth at base of telson. Postero-inferior angle of pleon segment 3 quadrate, with a very slightly produced point; a few widely-spaced setules on hind margin above the angle. Telson with a minute setule in a notch on apex of each lobe, and four to five setules on upper surface. Antenna 1, flagellum 10-jointed, accessory flagellum 4-jointed. Antenna 2, flagellum 10-1 i-jointed. Maxillary palp not much widened. Maxilliped, outer plate with margin convex. Gnathopods 1 and 2 and peraeopods 1 and 2 as in acanthurus. Peraeopods 3 and 4, 2nd joint obovate, wider distally, hind margin with a few crenulations, each notch with a setule. Peraeopod 5, 2nd joint broadly expanded, subcircular, hind margin crenulate, 4th joint strongly expanded on hind margin. Remarks. A species resembling thompsoni in the unidentate pleon segments, acanthurus in the telson and general features, but distinguished from all the three species of the genus by the 5th peraeopod. Genus Syrrhoe, Goes. Stebbing, 1906, p. 281. Sexton, 1911, p. 202. Monod, 1926, p. 54. Syrrhoe psychrophila, Monod (Fig. 87). Monod, 1926, p. 54, fig. 52 (crenulata, var.). Schellenberg, 1931, p. 159, fig. 83. Occurrence: 1. St. 45. South Georgia. 2 $$ 12 mm. 2. St. 140. South Georgia. 2 $$ 9 mm., 2 $? 8-9 mm. 3. St. 144. South Georgia. 1 cj 10 mm., 5 $? 8-10 mm. 4. St. 156. South Georgia. 1 $ 10 mm., 1 juv. 7 mm. Remarks. Monod distinguishes the Antarctic variety mainly by the gap in the denticulation on the posterior margin of pleon seg- ment 3 ; the other two characteristics seem likely to be inconstant. The present specimens have no denticulation on peraeon seg- ment 7 or on pleon segment 4. The denticulation on pleon segment 3 is interrupted
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