138 ■ DISCOVERY REPORTS 



Lumbrinereis antarctica, n.sp, 



St. 182. 14. iii. 27. Schollaert Channel, Palmer Archipelago. 64° 21' 00" S, 62° 58' 00" W. 

 278-500111. Gear N 7-T. Bottom; mud. One specimen. 



Description. The specimen from St. 182 is incomplete posteriorly and measures 

 34 mm. by 2 mm. without the feet for 80 chaetigers. The body is not tapered at the 

 ends. 



The prostomium (Fig. 5i,<7) is equal in length to the first four segments and is 

 rather sharply pointed. On the underside the usual pair of buccal cushions is present, 

 and the second segment appears to be prolonged to form the lower lip of the mouth, 

 but this is not very clear in the specimen. The first segment is very slightly longer than 

 the second. 



The feet (Fig. 51, i, c and d) increase rather rapidly in size up to the 6th chaetiger. 

 The anterior lip of the pedal lobe is rounded and not at all prominent, and the posterior 

 lip in the front part of the body forms a slender digitiform process : further back it 

 becomes gradually smaller until towards the end of the fragment it is reduced to a small 

 papilla. 



The bristles present a remarkable appearance because the lower part of their shafts 

 is black and the upper part yellow. The feet are supported by two black acicula. As 

 far as about the loth foot the bristles are limbate capillaries (Fig. 51, ^); further back 

 a number of simple crochets (Fig. 51,/) with long flanges appears. Towards the hinder 

 end of the fragment the flanges of the simple crochets become shorter. The limbate 

 capillaries are replaced by simple capillaries. 



The mandible (Fig. 51,^) is a light and delicate structure, the details of which are 

 given in the figure. 



Of the upper jaws (Fig. 51, //) M. I is a pair of simple pincers. M. II has three large 

 teeth. M. Ill is a slender triangular plate with a single tooth. M. IV is a very large 

 single-toothed triangular plate. 



Remarks. This species is characterised by the very small digitiform posterior lip of 

 the foot, by the half black, half yellow bristles and the arrangement of M. Ill and M. IV. 

 It is allied to the European L.fragilis (O. F. Miiller), but distinguished by the character 

 of the feet and the more anterior position of the simple crochets. 



Genus Augeneria^, gen. nov. 



Diagnosis. As Lumbrinereis, but with three small tentacles on the hinder edge of 

 the prostomium and partly hidden in a crescentic groove between the prostomium and 

 buccal segment, as in Holla. 



' This genus is named after Dr H. Augener of Hamburg, the author of many valuable contributions 

 to our knowledge of the Polychaeta. 



