96 DISCOVERY REPORTS 



Genus Halosydna, Kinberg 



Body oblong. Lateral tentacles subterminally inserted. Pairs of elytra i8 or 21, 

 covering the terminal segments. Dorsal bristles rather slender and strongly pectinated, 

 ventral with rows of frills below the tip, which may be either unidentate or 

 bidentate. 



Halosydna patagonica, Kinberg. 



Kinberg, 1857, p. 17, pi. v, fig. 23 a-h. 

 Seidler, 1924, p. 116, with synonymy. 



Occurrence. St. WS 762 (2); WS 834 (20); WS 837 (i); WS 847 (i). 



Specific characters. Thirty-six segments and eighteen pairs of elytra. The elytra 

 are fringed and covered with small tubercles in addition to which there are a number 

 of large conical vesicles well figured by Kinberg (fig. 23 H). The dorsal bristles are 

 slender and heavily pectinated, the ventral are rather stout, bidentate and with frilled 

 ends. The neuropod of the ist chaetiger carries special bristles, which are delicate and 

 barbed. 



Remarks. This species does not apparently penetrate as far south as South Georgia, 

 for it was not represented in the extensive collections from that area made by the 

 'Discovery' in 1925-7, nor is it reported by Bergstrom from the collections of the 

 Swedish South Polar Expedition. 



Genus Antinoe, Kinberg 



Fifteen or sixteen pairs of elytra arranged as in Harmothoe . The lateral tentacles are 

 inserted ventrally and prostomial peaks are present. The dorsal bristles are stout and 

 pectinated ; the ventral are long and slender with elongated spinous regions and hair- 

 like tips. 



Antinoe antarctica (Bergstrom). 



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

 Antinoe antarctica, Monro, 1930, p. 66, fig. 18, 



Occurrence. St. 39 (i); 123 (2); 142 (i); WS 211 (3 juv.); WS 212 (numerous); WS 213 (5); 

 WS 214 (7); WS 229 (numerous fragments); WS 234 (6); WS 236 (numerous fragments); WS 237 

 (4); WS 244 (5); WS 748 (2); WS 752 (i); WS 758 (i); WS 773 (numerous fragments); WS 784 (i); 

 WS 805 (numerous fragments); WS 839 (2 juv.). 



Specific characters. The head is very broad and divided by a median groove. The 

 prostomial peaks are not clearly defined. The eyes are very small and sometimes 

 invisible. The median tentaculophore is very large and all three tentaculophores are 

 reddish brown. The elytra have a variable number of small tubercles and on their 

 external margin a few clavate papillae. There are 15 pairs as in Harmothoe. The dorsal 

 bristles are lightly pectinated and the ventral are long, slender, unidentate and end in 

 a bearded or hirsute tip. 



