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); WS 825 (numerous); 

 WS 840 (numerous); WS 851 (i); WS 871 (10); WS 877 (2). 



Specific characters. Size up to about 175 mm. by 8 mm. including the feet. In 

 spirit the body is without colour-markings. There are no paragnaths. The first two feet 

 are uniramous. In the anterior region the notopod has two large languets, the lower 

 rather shorter than the upper, and between them a third much smaller languet. The 

 dorsal cirrus extends well beyond the end of the upper dorsal languet. The neuropodial 

 lobe has two unequal lips, the anterior rounded and the posterior longer and conical. 

 The ventral languet is broader and blunter than those of the notopod. The ventral cirrus 

 reaches to the end of the ventral languet. The posterior feet differ from the anterior 

 only in the more slender and pointed character of the languets. 



