. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. Fig. 24. Platynereis magalhaensis. Head from above. 138 DISCOVERY REPORTS Specific characters. Up to about 80 mm. in length for 90 chaetigers. Just in front of the buccal segment in the median dorsal line there is a small nuchal cushion and on either side of this a small crescentic ridge behind the eyes (Fig. 24). The paragnaths are small: (I) none; (II) none; (III) a small transverse distichous group; (IV) several rows of pectinae; (V) none; (VI) one or two concentric arcs on each side; (VII) a
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. Fig. 24. Platynereis magalhaensis. Head from above. 138 DISCOVERY REPORTS Specific characters. Up to about 80 mm. in length for 90 chaetigers. Just in front of the buccal segment in the median dorsal line there is a small nuchal cushion and on either side of this a small crescentic ridge behind the eyes (Fig. 24). The paragnaths are small: (I) none; (II) none; (III) a small transverse distichous group; (IV) several rows of pectinae; (V) none; (VI) one or two concentric arcs on each side; (VII) and (VIII) several small groups composed of one or two rows of small paragnaths. The dorsal ramus of the anterior feet has a pair of triangular, subequal languets and a small conical chaetal lobe. There is a pair of dark glands in the dorsal languet, which is shorter than the dorsal cirrus. In the ventral ramus there is a blunt chaetal lobe and a ventral languet a little longer than the lobe. There is a small ventral cirrus. In the hinder region the pedal languets are narrower and more elongate. The dorsal bristles are homogomph spinigers: the upper ventral bristles are homogomph spinigers and heterogomph falcigers; the lower ventral bristles are heterogomph spinigers and heterogomph falcigers. In young specimens in the hinder region the dorsal ramus carries one or two special homogomph falcigers with curved tips attached to the blade. Remarks. I have already (1930, p. 106) discussed the relations of this species and I have nothing to add. Genus Leptonereis, Kinberg No paragnaths on the proboscis. Jaws are present and sometimes a number of soft papillae. Leptonereis loxechini (Kinberg). Nereis loxechini, Ehlers, 1908, p. 73, pi. vii, figs. 8-12; and 1913, p. 497. Leptonereis loxechini, Monro, 1930, p. 107, fig. 38. Occurrence. St. 123 (3); 170 (2); 175 (2); WS 225 (i); WS 228 (8); WS 231 (i); WS 246 (20); WS 248 (8); WS 249 (i); WS 773 (i); WS 781 (i); WS 803 (i); WS 824 (28); W
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