66 DISCOVERY REPORTS 



Description. The measurement is 21 mm. by 3 mm. excluding the feet. In spirit 

 the dorsum is black merging into grey at the hinder end, except for the elytrophores 

 and pseudoelytrophores which are white. The median tentaculophore is marked with 

 chestnut brown, and there are two patches of this colour below the lateral tentacles. 



The prostomium (Fig. 17, a) is subrectangular and divided by a median groove. The 

 eyes are small, and the front pair is near the anterior lateral edges of the prostomium; 

 the hinder pair is near the posterior lateral edges. There is a stout median tentaculo- 

 phore, by the sides of which are the two inconspicuous prostomial peaks. The lateral 

 tentacles are inserted ventrally, and are very small. The palps are long, smooth and 

 tapering. The median tentacle and all the tentacular cirri except one are lost; this cirrus 

 is papillose. 



There are 15 elytrophores, and all the elytra are lost; behind the hindermost elytro- 

 phore are only four chaetigers. The dorsal cirri are all lost, and the cirrophores are 

 placed low down on the feet just above the dorsal bristles. All the cirrigerous segments 

 have small pad-like pseudoelytrophores. 



The structure of the feet is harmothoid in character. The dorsal chaetae (Fig. ly, b 

 and c) are numerous with rather irregular rows of very fine scales, and end in a bearded 

 tip. The aciculum is mid-ventral in position. 



The ventral chaetae (Fig. 17, d and e) are also numerous, more slender than the 

 dorsal, with two rows of teeth and a fine unidentate tip covered with a number of delicate 

 hairs. The ventral cirri are short and very slender. 



Remarks. This species combines the penicillate dorsal chaetae, which distinguish 

 Bergstrom's Barriikia, with filamentous ventral chaetae very like those of his Austro- 

 laenilla antarctica. The ventral bristles of A. setobarba are unidentate, and those of 

 Bergstrom's species are bidentate. 



I know of no other Polynoid that has bearded tips to both its dorsal and its ventral 

 chaetae. 



Antinoe antarctica (Bergstrom). 



Austrolaenilla antarctica, Bergstrom, 1916, pp. 291-294, pi. iii, fig. 8; pi. v, figs, i and 2. 



St. 29. 16. iii. 26. West Cumberland Bay, South Georgia. 5-9 miles S 51° W of Jason Light. 

 23 m. Gear DC. Bottom : mud and stones. One specimen. 



St. 39. 25. iii. 26. East Cumberland Bay, South Georgia. From 8 cables S 81° W of Merton Rock 

 to 1-3 miles N 7 " E of Macmahon Rock. 179-235 m. Gear N 7-T. Bottom: grey mud. Two 

 specimens. 



St. 45. 6. iv. 26. 27 miles S 85° E of Jason Light, South Georgia. 238-270 m. Gear OTL. 

 Bottom: grey mud. Sixteen specimens. 



St. 123. 15. xii. 26. Off mouth of Cumberland Bay, South Georgia. From 4-1 miles N 54° E 

 of Larsen Point to 1-2 miles S 62° W of Merton Rock. 230-250 m. Gear OTL. Bottom: grey 

 mud. Six specimens. 



St. 140. 23. xii. 26. Stromness Harbour to Larsen Point, South Georgia. From 54° 02' S, 

 36° 38' W to 54° 11' 30" S, 36 ' 29' W. 122-136 m. Gear OTL. Bottom: green mud and stones. 

 One specimen. 



