I40 . DISCOVERY REPORTS 



Augeneria tentaculata, n.sp. 



St. 167. 20. ii. 27. Off Signy Island, South Orkneys. 60° 50' 30" S, 46° 15' 00" W. 244-344 ™- 

 Gear N 4-T. Bottom: green mud. Fourteen specimens. 



St. 187. 18.iii.27. Neumayr Channel, Palmer Archipelago. 64° 48' 30" S, 63° 31' 30" W. 259 m. 

 Gear DLH. Bottom: mud. One specimen. 



Description. The great majority of the specimens are incomplete posteriorly. The 

 largest complete specimen measures 135 mm. by 3 mm. without the feet and has about 

 no chaetigers. 



All colour has disappeared from most of the specimens, but traces of a thin 

 transverse colour band joining the bases of the feet remain in a few. When present, 

 this does not begin before the 6th chaetiger. The body is of the usual " Lianbriuereis" 

 shape, cylindrical in front and more flattened posteriorly: it does not taper at the ends. 



The prostomium (Fig. 52, a) is of a rounded oval form without a trace of eyes. The 

 three small subequal tentacles situated at the hinder edge of the prostomium are some- 

 times almost hidden in a groove where a crescentic re-entrant is carved out of the 

 anterior border of the first segment. In this groove the evaginable nuchal organs are 

 also situated. On the undersurface of the prostomium (Fig. 52, b) is a pair of large 

 buccal cushions. The second segment is carried forward to form the lower border of 

 the mouth in a manner similar to that in Liimbrinereis magalhaensis. 



The I St segment is about half as long again as the 2nd. The first two segments are 

 achaetous. For the first five chaetigers the feet gradually increase in length. The 

 anterior lip of the chaetal lobe is rounded and does not project, the posterior lip forms 

 a conical process. There are no pedal cirri nor branchiae. 



The anterior feet (Fig. 52, c) carry compound crochets and bordered capillaries 

 (Fig. 52, d). In the compound crochets (Fig. 52, e) the end-piece or blade is rather 

 short, its length being less than the length of the continuation of the cutting flange 

 below the joint. At the apex of the blade there are about four teeth above the main fang. 



In the middle feet compound crochets are replaced by simple crochets (Fig. 52,/) 

 with four to five teeth, and the capillaries have narrower borders and long and extremely 

 delicate ends. In each foot the most dorsal bristle is a single giant simple crochet 

 (Fig. 52,^), of the same form as, but larger than the rest of, the crochets in the foot. 

 In the posterior feet (Fig. 52, h) the postchaetal lobe becomes more pointed, and the 

 bordered capillaries are replaced by simple capillaries. About the last 20 feet have 

 simple crochets only. 



I can see no acicula. 



The lower jaw (Fig. 52, i) is rather short, longitudinally striated, and with small 

 calcareous end-pieces. Regarding the maxillae (Fig. 52, k), M. I is a pair of simple 

 black pincers. M. II is a pair of heavy plates with three teeth. M. Ill has two teeth. 

 M. IV is a pair of large subrectangular plates without any clearly defined teeth. The 

 carriers are narrow and pointed. 



