32 DISCOVERY REPORTS 



form. The dorsal and ventral cirri are small and papilliform, except the tentaculiform 

 dorsal cirrus of the ist chaetiger. I can distinguish no straight denticulated chaetae 

 in the upper ramus of the foot, and the bristles of the lower ramus (Fig. 2, b) have a 

 secondary tooth, absent in the adult. There is a large prominent anus on the dorsal 

 surface of the last segment. 



By the time a length of 2 mm. is reached with 12 chaetigers, two and three branched 

 gills are developed. 



Genus Paramphinome, M. Sars 



Paramphinome australis, n.sp. 



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

 GearN4-T. Bottom: green mud. One specimen. 



Description. Length 46 mm., breadth 4 mm. anteriorly and 2 mm. at the posterior 

 end, both measurements excluding the feet. Colour in spirit a very pale yellow. The 

 body is long and vermiform and flattened dorso-ventrally : behind the gill region the 

 intersegmental constrictions are very marked giving the body a moniliform appearance. 

 The head is rounded in front and sends a roughly cordiform prolongation backwards 

 to the posterior border of the ist chaetiger which at the sides extends forward as far 

 as the base of the palps. There are no eyes. A pair of small lateral tentacles is situated 

 on either side of the front of the prostomium and there is a median tentacle at the same 

 level as the dorsal cirrus of the ist chaetiger. Below and to the side of the lateral 

 tentacles is a pair of small tapering palps. The dorsal cirrus of the ist chaetiger is 

 twice as long as the head appendages and slightly longer than the ventral cirrus. 



There are 13 pairs of gills and they begin on the 4th chaetiger. They are arborescent 

 and richly branched (Fig. 3, a) and grow out of the back just behind the notopodial 

 lobe. From the 7th to the 15th chaetiger they almost meet in the mid-dorsal line. 



The two fairly prominent lobes of the feet are widely separated (Fig. 3, b) the noto- 

 podium being actually dorsal and the neuropodium ventro-lateral. Except for the 

 ist chaetiger the cirri are very small and almost rudimentarj'' ; the dorsal cirrus is just 

 behind the notopodial lobe and the ventral below the neuropodium. 



On the ist chaetiger below the dorsal cirri on either side is a pair of large curved 

 chitinous hooks. These can be seen under a dissecting microscope, and a wish to 

 preserve the single type specimen as intact as possible prevents me from removing them 

 for detailed study. 



The bristles of the feet are exceedingly fragile and so much damaged that they render 

 a satisfactory study of them very difficult. In the dorsal lobe there are two kinds of 

 bristles: (i) short moderately stout smooth spear-like bristles (Fig. 3, c), and (2) a few 

 very fine capillary bristles proximally smooth and distally delicately serrated on one 

 side (Fig. 3, d). In the ventral lobe the bristles are of three kinds: (i) a large number 

 of extremely delicate capillary chaetae in which the lower part is smooth and the upper 

 finely denticulated on one side only (Fig. 3, e); (2) near the ventral cirrus are a few 

 knife-shaped short bristles with a small spur and a row of teeth reaching to the tip 



