Polychacta. 27 1 



The posterior border of the prostomium is emarginate, with a 

 nuchal papilhx in the notcli.^ With regard to the tentacular cirri, 

 Langerhans states that the first (buccal) segment carries three pairs 

 of tentacular cirri with annulate bases,^ while the second segment 

 bears one pair of tentacular cirri and one cirrus vcntralis foliaccus, 

 but no setae. This description tallies with Malmgren's diagnosis of 

 Anaitis, but is not in accord with my observations. In tlie ' Southern 

 Cross' specimen, with proboscis three parts extruded, it is quite 

 evident that the dorsum of the true buccal segment is invisible from 

 above, unless it is represented by the nuchal papilla. Below and at 

 the sides, however, the buccal segment is clearly visible and bears 

 laterally a pair of cirri ; ^ the second segment bears two cirri on each 

 side, namely, the most dorsally placed long cirrus in the figure and 

 the shortest pair of cirri below it ; * the third segment bears a pair 

 of tentacular cirri, namely, the long cirrus immediately below the 

 most dorsally placed cirrus on each side in the figure; below this 

 last tentacular cirrus there is a cirrus vcniralis foliaccus, as described 

 by Langerhans. 



The following table recapitulates the foregoing observations : — 



Segment I. One pair of tentacular cirri and a median dorsal nuchal papilla. 

 Segment 11. Two pairs of tentacular cirri, namely, a dorsal and a ventral pair. 

 Segment 111. One pair of tentacular cirri and a paired cirrus ventraUs foliaccus. 



One specimen, 72 mm. long, 3 mm. wide over the parapodia, 

 was taken off Cape Adare in 20 to 24 fathoms. 



LCIOPIDAE. 



Vanadis. 



Appendix terminalis pedum cirriformis ; setae compositae capillares ; antennae Y. 



6. Vanadis antakctica. 



(PL XLIV., fig. 8, and PI. XLVI., figs. 1-2.) 



Alciopa antarctica, Mcyntosh, 1885, ' Clmllenfjer'' Eep., p. 175. 



Vanadis antarctica, Apstein, 1900. ' Die Alciopiden und Tomopteriden dcr 

 Plankton Exped.,' Bd. II., H. b., p. 11. 



^ The notch is deeper and more acute than shown in the figure. 

 ^ The annulation of ihe cirrophores cannot be discerned in the 'Southern Cross'' 

 specimen. 



^ The longer of the two short cirri on each side in the figure. 



■* It is necessary to examine in side view to see these relations properly. 



