. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 122 DISCOVERY REPORTS Gnathiphimedia sexdentata, Schell. Schellenberg, 1926, p. 331; 1931, p. 116. Barnard, 1930, pp. 353, 449, fig. 27 {pacifica, non Stebb.). ? Walker, 1907, p. 27 {pacifica, non Stebb.). ? Chevreux, 1913, p. 118 {pacifica, non Stebb.). Occurrence: 1. St. 123. South Georgia. 1 ^ 10 mm., 1 $ 11 mm. 2. St. 148. South Georgia. 1 $ 11 mm. 3. St. 149. South Georgia. 1 $ 9 mm., 1 ovig. $ 11 mm. 4. St. 156. South Georgia. 1 £ 10 mm. 5. St. 170. South Shetland's. 1 $ 11-5 mm. 6. St. 17
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 122 DISCOVERY REPORTS Gnathiphimedia sexdentata, Schell. Schellenberg, 1926, p. 331; 1931, p. 116. Barnard, 1930, pp. 353, 449, fig. 27 {pacifica, non Stebb.). ? Walker, 1907, p. 27 {pacifica, non Stebb.). ? Chevreux, 1913, p. 118 {pacifica, non Stebb.). Occurrence: 1. St. 123. South Georgia. 1 ^ 10 mm., 1 $ 11 mm. 2. St. 148. South Georgia. 1 $ 11 mm. 3. St. 149. South Georgia. 1 $ 9 mm., 1 ovig. $ 11 mm. 4. St. 156. South Georgia. 1 £ 10 mm. 5. St. 170. South Shetland's. 1 $ 11-5 mm. 6. St. 175. South Shetlands. 1 $ 11-5 mm., 1 $ 13 mm. 7. St. 190. Palmer Archipelago (90-130 m.). 1^11-5 mm. 8. St. 190. Palmer Archipelago (315 m.). 1 <$ 13 mm., 1^15 mm. Remarks. These specimens are all smaller than those of the Terra Nova collection, but otherwise they are in agreement. In most the side-plates 1 and 2 are as figured (1930), but in some cases side-plate 1 is truncate and slightly concave below, and side- plate 2 is subtruncate. There is no trace of a dorsal keel on pleon segments 1-3. I am now convinced that neither the Terra Nova nor the Discovery (1925-7) specimens should be identified with pacifica, Stebb. There can be little doubt that Walker's specimens, also from McMurdo Sound, are the same as the Terra Nova specimens; and in all probability the Pourquoi Pas specimens from Marguerite Bay should also be referred to sexdentata. Distribution. 'Gauss' winter station, 385 m.; McMurdo Sound, 256-547 m. Probably also Marguerite Bay, 50-200 m. Gnathiphimedia macrops, (Fig. 68). Occurrence: St. 42. South Georgia. 1 g 11-5 mm. Description. Resembling sexdentata (cf. Barnard, 1930, fig. 27, as pacifica) as re- gards the dorsal armature and gibbous pleon segment 3, and 2nd joints of peraeopods 3-5. Antero-lateral margin of head with a narrow notch separating a rounded tooth above and a long acute tooth below. Eyes very large. Side-plate 1 oblong, lower margin conc
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