NEREIDAE 135 



Specific characters. Size up to about 130 mm. by 5 mm. without the feet for 85 

 chaetigers. There are very distinct reddish brown markings on the head and back and 

 the pedal glands are brown. There are no paragnaths on the maxillary ring. On the 

 oral ring there is a pair of paragnaths side by side on group V. There is none on 

 group VI. Groups VII and VIII consist of a single row of seven or eight rather large, 

 widely spaced paragnaths. 



In the anterior region the notopod has two conical dorsal languets of about the same 

 size, between which is a third very small languet in contact with the bristles. The neuro- 

 podial chaeta-sac has two unequal lips, the anterior rounded and the posterior longer 

 and conical. The ventral languet is broader and blunter than those of the dorsal branch. 

 The dorsal cirrus extends for about half its length beyond the end of the upper dorsal 

 languet, and the ventral cirrus is the same length as the ventral languet. In the hinder 

 region the intermediate dorsal languet disappears: otherwise there is very little change. 

 The dorsal bristle bundle contains homogomph spinigers, the upper ventral bundle 

 homogomph spinigers and heterogomph falcigers and the lower ventral bundle a single 

 heterogomph spiniger and heterogomph falcigers. 



St. WS 756 yielded an epitocous female with the modified region beginning at the 

 20th chaetiger. 



Nereis cricognatha, Ehlers. 



Ehlers, 1904, p. 29, pi. iv, figs. 3-7. 

 Augener, 1913, p. 163; and 1924, p. 334. 



Occurrence. St. 929, New Zealand (2). 



Specific characters. The larger specimen measures 70 mm. by 4 mm. for 60 

 chaetigers. The paragnaths have the following arrangement: (I) a square or lozenge 

 shaped cluster ; (II) an oblique, subtriangular band ; (III) a transverse cluster ; (IV) more 

 or less triangular patches; (V), (VI), (VII) and (VIII) form an uninterrupted band of 

 paragnaths about eight or nine deep. The dorsal ramus of the foot has three languets, of 

 which the uppermost is considerably larger than the rest : it is triangular and with a very 

 broad base. The intermediate is small, pointed and conical, and the lower languet is a 

 little narrower and smaller than the upper. The dorsal cirrus is short and does not reach 

 to the end of the upper languet. 



The ventral ramus has a chaetal lobe with two rather unequal lips, a ventral languet 

 of about the same length and a minute ventral cirrus set far back on the foot. In the 

 hinder region the upper dorsal languet increases a little in size relatively to the lower, 

 but it does not become either swollen or foliaceous. 



The heterogomph falcigers have all rather long, knife-like blades with a hooked tip. 

 I can see no heterogomph spinigers. The similarity of the present species to A^. caudata 

 has already been pointed out. 



Nereis callaoana, Grube. 



Nereis angusta, Kinberg, 1857, p. 51, pi. xx, fig. 2. 

 Nereis callaoana, Augener, 191 8, p. 184, with synonymy. 

 Occurrence. St. 399, Gough Island (7). 



