Polychaeta. 28 1 



15. Ekeutho antakctica. 



(PI. XLII., fig. 6, and PI. XLVL, fig. 6.) 

 Fasciculi setarum capillarium a segmento tertio incipientes in segmeutis XI obvii. 



Capillary setae in eleven segments followed by twelve uncini- 

 gerous segments ; specimen measuring about 15 mm. in length over 

 all, apparently incomplete behind ; posterior three-fifths of thoracic 

 region swollen and ovigerous, ova showing through the body-wall ; 

 uncini uniserial, confined to abdominal region ; tentacles grooved on 

 their inner faces. 



The form of the uncini (PI. XLVI., fig. 6) curiously resembles 

 that of the uncini of Polycirrus kcrguelcnsis, Mclnt./ rather than 

 those of other species of the genus,^ more especially in regard to the 

 length of the manubrium, thus indicating the validity of the species. 



One specimen was taken at Cape Adare, 25th January, 1900, washed 

 up after a gale. 



ADDENDUM. 



Besides the material obtained in the neighbourhood of Cape 

 Adare, there is a very small tube of worms from the Auckland 

 Islands. These include a small Nereid, of which the proboscis is not 

 extruded, and a Hesionid allied to Oxydromms. As the latter is of 

 some interest zoogeographically I append a brief description, namiug 

 it Oxydromus aucklandicus. 



The antennae and the styles or terminal joints of the biarticulate 

 palps are fusilbrm with filiform acuminate tips; the median antenna 

 (tentaculum) is much shorter than the paired antennae and, like them, 

 frontal in origin ; eyes in a wide trapezium, the anterior larger and 

 crescentic ; the tentacular cirri are all lost, only their bases remain- 

 ing, and repeated examination only revealed traces of six pairs ; the 

 dorsal rami of the parapcdia are inseparably connate with the 

 cirrophores of the dorsal cirri, as in Podarkc viridescens, Ehl, and 

 are armed with a few delicate simple setae ; ventral setae with 

 long graduating falciform appendix with finely serrulate edge and 

 bidentate apex ; there are forty-two setigerous segments ; length 

 15 mm. ; width over the setae 4 mm., without the setae, 3 mm. 



Locality. — Auckland Islands, one specimen from ten fathoms. 



1 ' Challenger' Kep., PI. XXVIIIa, fig. 22. 



^ E.rj., Ereufho smiiti, Malmgren, 1865, from Spitzbergen, and E. kerffueJensts, 

 Mcintosh, 1885, from Kerguelen. 



