INCERTAE SEDIS 193 



necessary to reconstruct the classification with much wider generic divisions. The 

 present species is very close to if not identical with Pixell's Spirobranchiis maldivensis . 

 Pixell's species is described as having a sHghtly higher number of teeth in the uncini — 

 to which little importance is to be attached, especially as an exact count is very difficult 

 to make — and as having an operculum with only a single calcareous plate. The smaller of 

 the present specimens and one of the examples of Mcintosh's ' Challenger' Pomatoceros 

 strigiceps which Benham rightly identifies with Marenzeller's species, have a single 

 opercular plate and appear to be inseparable from Pixell's maldivensis. 



INCERTAE SEDIS 



Loandalia aberrans, gen. et sp.nov. (Fig. 34 a-h). 



Occurrence. St. 274, off St Paul de Loanda, Angola. From 8° 40' 15" S, 13° 13' 45" E to 

 8° 38' 15" S, 13° 13' 00" E. 64-6501. Gear N4-T. Bottom grey mud. One specimen. 



Description. The specimen measures 35 mm. by i mm. for no chaetigers. The 

 body is more or less cylindrical, somewhat flattened ventrally. The colour in spirit is 

 pale yellow with indefinite brown markings along the sides. The pharynx is almost but 

 not quite fully withdrawn and the exact shape of the head (Fig. 34 a) is difficult to 

 determine. It is much broader than long and is squarely cut oft" in front. There are no 

 eyes, and no tentacles or tentacular cirri. There is a minute pair of palps at the front 

 border of the head. These consist of small cylindrical palpophores surmounted by 

 minute button-like palps (Fig. 34 b). 



I cannot distinguish the buccal segment from the head. The first foot is represented 

 by a large black broken acicular bristle or hook high up on the sides of the body in the 

 notopodial position. The second chaetiger is represented by a similar large black hook, 

 also broken, accompanied by one or two minute bristles. This hook instead of being 

 notopodial in position is neuropodial and there is no notopod. 



The normal neuropods begin at the 3rd chaetiger and consist of cyhndrical lobes 

 carrying about half a dozen bristles. They are rather longer in the posterior region than 

 in front. They are supported by an aciculum. For the first five or six chaetigers I can 

 see no notopod. At about the 7th chaetiger the notopods appear in the form of small 

 buttons, each with a large, colourless, transparent acicular chaeta or hook accompanied 

 by two or three very minute bristles (Fig. 34 c). These hooks are all broken at the end, 

 and look as if they were partly calcareous and had been attacked by acid. The minute 

 notopodial bristles are nearly all lost. There are no dorsal cirri and the ventral cirri are 

 small, papilliform processes coming out from the lip of the neuropodial chaeta-sac at its 

 most ventral point. 



The pharynx is unarmed and there is a thick muscular pharyngeal bulb occupying 

 about the first five chaetigers. At the 54th chaetiger small, cirriform gills begin. They 

 are shorter than the neuropodial lobes and are inserted at the hinder edges of the seg- 

 ments on a level with the neuropods (Fig. 34 d). They are continued to the end of the 

 body. As regards the bristles, the notopodium carries a single very large transparent 

 colourless hook and two or three minute bristles (Fig. 34 e). The latter are quite smooth. 



