. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. PODOCERIDAE 247 Podocerus, sp. (Fig. 155). Occurrence: St. 42. South Georgia. 1 immat. 4 mm. Remarks. Dorsal profile somewhat resembling that oidanae, Stebb. (1888, pi. cxxviii), but the projections are not keels so much as corrugations or transverse ridges on the hind margins of the segments. The ridges are slightly more raised medio-dorsally into tubercles on peraeon segments 4-7 and pleon segment 1, and there are very faint indications of a smaller dorso-lateral tubercle on each Fig. 1
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. PODOCERIDAE 247 Podocerus, sp. (Fig. 155). Occurrence: St. 42. South Georgia. 1 immat. 4 mm. Remarks. Dorsal profile somewhat resembling that oidanae, Stebb. (1888, pi. cxxviii), but the projections are not keels so much as corrugations or transverse ridges on the hind margins of the segments. The ridges are slightly more raised medio-dorsally into tubercles on peraeon segments 4-7 and pleon segment 1, and there are very faint indications of a smaller dorso-lateral tubercle on each Fig. 155. Podocerus, sp. St. 42. Dorsal profile. Gnathopod 2, 6th joint subcircular, palm defined from hind margin only by a small tooth. Peraeopods 1 and 2, 2nd joint slender, linear. Peraeopods 3-5, 2nd joints feebly pyriform, slightly wider proximally than distally. With only one immature specimen (probably <$) it is not advisable to assign a specific name in this case. Gammarideorum incertae sedis Didymochelia, Brnrd. Barnard, 1931, p. 429. No rostrum. No eyes. Side-plates well developed, 4 feebly emarginate behind, 5 bilobed. Pleon segments 5 and 6 very short. Telson transversely oblong, entire. Antenna 1 stout, with a short accessory flagellum. Mouth-parts prominently projecting. Upper lip elongate, narrow. Lower lip with acuminate outer lobes and very small mandibular processes, without inner lobes. Maxilla 1, inner lobe setose along whole inner margin, palp obscurely 2-jointed. Maxilla 2, inner lobe with oblique row of setae as well as the marginal row. Gnathopods 1 and 2 not strong, chelate. Peraeopods 1-5 alike, stout. Uropods 1 and 2 stout, biramous. Uropod 3 rudimentary, consisting of a small ovate peduncle only. Remarks. It is difficult to decide on the affinities of this Amphipod. Several of its features, such as the projecting and somewhat pointed mouth-parts, the similarity of the peraeopods, and the reduction of uropod 3, would seem to be due to its habitat and mo
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