POLYNOIDAE 



65 



The ventral bristles (Fig. 16,^) are about twice the length of the dorsal, and slender, 

 with smooth unidentate tips and fine spirally arranged whorls of teeth going up the 

 shaft. There is a pair of long pygidial styles. 



Remarks. This pelagic polynoid has much in common with Herdmonella gracilis, 

 Ehlers (Ehlers, 1908, p. 44). The shape of the head appears to be similar, and there are 

 great resemblances in the structure of the bristles. In Ehlers' species the lateral ten- 

 tacles are relatively longer, and there are only eight pairs of elytra. It is possible that 

 H. gracilis may be a young stage of the present species, just as the present species is 

 probably the pelagic phase of some bottom living form. 



I have attributed this example to the genus Antiiioe on the ground of the fine hairlike 

 ventral bristles. 



Antinoe setobarba, n.sp. 



St. 195. 30. iii. 27. Admiralty Bay, King George Island, South Shetlands. 62^ 07' 00" S, 

 58^ 28' 30" W. 391m. Gear OTM. Bottom: mud and stones. One specimen. 



3mm7 



I mm 



•8 mm 



^O 



O-L 



06 mm 



0-L 



■SmiriT 



0-L 



0-L 



Fig. 17 



Head. b. Dorsal bristle. 



d. Ventral bristle 



Antinoe setobarba. 

 c. Part of dorsal bristle highly magnified. 



e. Ventral bristle. 



