NEREIDAE i37 



rather large chaetal lobe with rounded lips and a blunt ventral languet. The dorsal 

 cirrus is considerably longer than the dorsal languet and the ventral cirrus is about the 

 same length as the ventral languet. In the hinder region the languets are more elongate 

 and narrower. 



The dorsal bristle bundle in the anterior region has homogomph spinigers ; the upper 

 ventral bundle has homogomph spinigers and heterogomph falcigers, and the lower 

 ventral bundle has heterogomph spinigers and heterogomph falcigers. In the hinder 

 region the homogomph spinigers of the notopodium disappear and their place is taken 

 by two or three homogomph falcigers with very short, blunt end-pieces. 



St. WS 834 yielded an epitocous male with the modified region beginning at the 

 32nd chaetiger. 



Nereis kerguelensis, Mcintosh. 



Mcintosh, 1885, p. 225, pi. XXXV, figs. 10-12; pi. xviA, figs. 17-18. 

 Ehlers, 1897, p. 65, pi. iv, figs. 81-93. 

 Monro, 1930, p. 103. 



Occurrence. St. MS 68 (i juv.); WS 25 (numerous); WS 27 (3); WS 83 (i). 



Specific characters. Up to about 40 mm. in length for 70 chaetigers. The tentacles 

 are shorter than the head and the two pairs of eyes are widely separated. The jaws are 

 brown and have five large teeth. The paragnaths are arranged as follows: (I) none or 

 one; (II) a small triangular group; (III) a small, irregular, horizontal group; (IV) a 

 triangular group ; (V) none ; (VI) one or two on each side ; (VII) and (VIII) a single row 

 of rather large paragnaths. 



In the anterior region the feet have three stout triangular dorsal languets, the middle 

 languet smaller than the others, and a dorsal cirrus slightly longer than the uppermost 

 languet; in the ventral ramus the chaetal lobe has two dissimilar lips and there is a 

 ventral languet about as long as the chaetal lobe. There is a tapering ventral cirrus 

 shorter than the ventral languet. In the hinder region the intermediate dorsal languet 

 disappears and the languets become narrower and more pointed. There is no increase 

 of size in the dorsal languet. The ventral cirrus is very short. 



The dorsal bristles consist of homogomph spinigers : the upper ventral bristles are 

 homogomph spinigers and heterogomph falcigers; the lower ventral bristles are also 

 homogomph spinigers and heterogomph falcigers. There are no heterogomph spinigers. 



Genus Platynereis, Kinberg 

 Horny paragnaths arranged in pectinate rows of minute denticles. Groups I, II and 

 V usually absent. 



Platynereis magalhaensis, Kinberg (Fig. 24). 



Fauvel, 191 6, p. 434, pi. viii, figs. 21, 22, with synonymy. 

 Monro, 1930, p. 106, fig. 37. 



Occurrence. St. 53 (2 juv.); WS 762 (numerous); WS 852 (6). 



