NEREIDAE 



105 



Nereis typhla, n.sp. 



St. 152. 17. i. 27. 53° 51' 30" S, 36" 18' 30" W. 245 m. Gear DLH. Bottom: rock. One 

 specimen. 



3 mm." 



_ .-T^ oi 



1mm- 



O-L 



a 



Fig. 36. Nereis typhla. 

 a. Head. b. Foot. 



Description. A single fragment measuring 26 mm. by 3 mm. including the feet and 

 with 58 chaetigers. The colour in spirit is a pale brown with a dark stripe down the 

 middle of the back, broader and more indistinct in front, narrower and more clearly 

 defined in the rest of the body. The prostomium (Fig. 36, a) is longer than broad and 

 the tentacles are about half its length. There are no eyes or ocular pigment of any kind, 

 even beneath the skin. The palps end in a conical terminal article. The tentacular cirri 

 are short, the longest reaching to the posterior border of the first chaetiger. The buccal 

 is twice the length of the following segment. The proboscis is withdrawn and the exact 

 arrangement of the paragnaths is difficult to discern. Of the oral ring Group VI alone 

 is represented by a small collocation of about five minute paragnaths. Of the maxillary 

 ring Group II is represented by a mass of about eight rather larger paragnaths, and 

 IV by an oblique distichous row of paragnaths of about the same size as those in 

 Group II. I am uncertain whether Group III is present. The jaws are of the usual form 

 with three teeth below the main fang. 



The feet (Fig. 36, b) are very like those of A^. eugeniae. The notopodium has two pointed 

 languets of about equal length, from between which the dorsal bristles emerge. The 

 lips of the neuropodial chaeta sac are unequal but with only a slight difference in size : 

 the ventral languet is of the same shape as the dorsal but a little smaller. The dorsal 

 cirrus is very slightly longer than the upper dorsal languet, and the ventral cirrus is 

 small, set far back and reaches about half-way down the ventral languet. The dorsal 

 bristle bundle contains homogomph spinigers, the upper ventral bundle homogomph 

 spinigers and heterogomph falcigers, the lower ventral bundle heterogomph spinigers 

 and heterogomph falcigers. 



14 



