158 DISCOVERY REPORTS 



lumbrinereid simple crochets with very long, narrow flanges and small denticulated 

 heads (Fig. 2Sg). Behind the first two or three feet and throughout the branchial 

 region there are dorsally a number of bordered capillaries (Fig. 28 h), below this three 

 or four elongate simple crochets and ventrally a second bundle of bordered capillaries. 

 In the hinder region the ventral bundle of capillaries disappears and the bristles consist 

 of bordered capillaries above and simple crochets below. These simple crochets are 

 normal in form, being shorter and having wider flanges and heads with about seven 

 well-developed teeth (Fig. 28 /). The specimen is incomplete behind and the bordered 

 capillaries are continued to the last segment of the fragment. 



I figure the jaws (Fig. 28 k, I). The carriers of the upper jaws are pointed. There is a 

 pair of accessory plates lying outside the pincers: M. II have six teeth; M. Ill and 

 M. IV appear each to be unidentate, and whereas the under side of M. Ill appears to 

 be smooth, that of M. IV is finely denticulated. 



Remarks. The Magellan A'", leptognatha, Ehlers, seems to be quite distinct. In the 

 first 35 chaetigers there are only capillary bristles and no crochets, and M. Ill and 

 M. IV are strongly denticulated. I have compared the present specimen with those 

 attributed by me {loc. cit., 1933) to Kinberg's N. chilensis. The latter have a very dif- 

 ferent facies. Apart from the greater complexity of the gills in chilensis, to which not 

 much importance may be attached, the second apodous, buccal segment is not involved 

 with the mouth, and the manner of the breaking up of the posterior Up of the chaeta-sac 

 into branchial filaments is different. 



According to Kinberg's figure the second buccal segment of his A^. brasiliensis is here 

 also not involved with the mouth (Kinberg, 1857, pi. xviii, fig. 33 c). 



Genus Drilonereis, Claparede 



Head devoid of appendages. Gills and ventral cirri absent, dorsal cirri rudimentary. 

 Bristles winged capillaries and at the base of the foot a large acicular spine. Labrum 

 rudimentary or absent. Upper jaws show a pair of mandibles with very long, delicate 

 supports, a pair of toothed plates and two to three pairs of hooks. 



Drilonereis filum (Claparede). 



Fauvel, 1923, p. 436, fig. 174 a-h. 



Occurrence. St. WS 776 (i). 



Specific characters. This is an anterior fragment measuring 51 mm. by 2 mm. for 

 65 chaetigers. A slender, elongate species. The prostomium is dorso-ventrally flattened, 

 lanceolate in outline and often with a median groove. The first buccal segment is longi- 

 tudinally grooved on the ventral side. The anterior lip of the foot is low, rounded and the 

 hinder is produced into a blunt conical process. At the top of the foot is a bundle of 

 small yellow acicula supporting a rudimentary dorsal cirrus. The acicula supporting 

 the foot have slender protruding tips. The bristles consist of winged capillaries and at 

 the base of the foot a large, light yellow acicular bristle. The jaws are variable. In the 

 present specimen the pincers are very faintly denticulated at their base; M. II have 



