500 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



a distal, knifelike blade with a single row of oblique cutting teeth; they 

 terminate distally in a pointed tip. The cutting teeth extend nearly to 

 the acute tip (pi. 62, fig. 5). The furcate spines are broad seen from 

 the V-shaped side (pi. 62, fig. 4) but seen from the front they are very 

 slender. It seems possible that they function from the second or smaller 

 aciculum and that they may serve to keep the toothed setae clean from 

 debris. This might be accomplished by drawing the setae through the 

 crotch of the forked spine since the latter has the size and dimensions 

 that would permit the toothed edge of the setae to be drawn through it. 



Far posterior parapodia (an eighth last one is shown in pi. 62, fig. 

 6) are much like those in the middle region but the proportions differ 

 slightly and the acicular spines tend to be stronger farther back. The 

 posterior end terminates in a simple ring with terminal anal aperture and 

 a pair of ventral, cirriform processes that are fused to each other across 

 the ventrum (pi. 62, fig. 2). 



The identity of these individuals with A. rigida Fauvel was at first 

 questioned because of the presence of only 2 instead of 4 eyes. The same 

 doubt applies to their comparison with A. gorgonensis Monro (1933, 

 p. 26) since the prostomium of the latter is also shown with 2 pairs of 

 eyes in which the 2 on a side are nearly contiguous. However, the 

 resemblances are so great in other respects that the foregoing conclusion 

 (see synonymy above) seems justified. The prostomium has short, 

 spindle-shaped antennae; the palpi have the unique lateral bosses at the 

 bases of the palpostyles; the parapodial parts are peculiar, including the 

 fusiform dorsal and ventral cirri, the nearly straight acicular spines in 

 notopodia and the similarly disposed neurosetae and the presence of fur- 

 cate spines. 



Discrepancies between the individuals described above and the known 

 published accounts of the species are noted. Prostomial eyes are said to 

 number 4 instead of 2. The paired prostomial antennae have been said 

 to be inserted on the palpophores. The small boss on the outer base of 

 the palpostyle has been described at the distal end of the palpophore 

 (Monro, 1933). The pygidium has been described with a pair of fusi- 

 form processes, seemingly separated from each other at the base. The 

 furcate spines have been shown in the superior part of the neuropodium 

 (Fauvel, 1923). The insertion of parts of the prostomium can easily be 

 mistaken since all parts are very small and the outlines between palpi and 

 prostomial lobes are distinguishable only with very favorable lighting and 

 microscopic equipment. The fusion of the anal processes is similarly 



