POLYCH^ETA. BENHAM. 221 



" large " ; they only reach about half way up the side of the 

 body towards the middle line, even when held vertically 

 up by forceps (PI. xli., fig. 69). 



The filaments are rather thick, springing close together in 

 this and other individuals, but in others they are relatively 

 more delicate (cf PI. xli., fig. 70 ; PI. xlii., fig. 78). 



The gill seems to be much contracted, and the lower fila- 

 ments do not reach to the end of the dorsal cirrus, but in 

 other specimens in which they are better preserved, the 

 lower gill filaments are longer than the dorsal cirrus. 



The chaetse present no special peculiarities. I find the 

 following numbers, in addition to the 4 or 5 minute "combs" 

 in the uppermost part of the bundle, there are 6 or 7 capilii- 

 forms without a flange, somewhat flattened and sword- 

 shaped ; then two golden acicula, with occasionally a third 

 one, below which are 12 " gomphotrichs "' (i.e., jointed or 

 compound chaetse), which decrease in number in the pos- 

 terior feet (PI. xli., fig. 71). After about the thirty-sixth 

 foot a subchsetal spine or acicular-chsetae appears. 



The subchsetal spine is golden, bidentate in the early 

 segments, but tridentate in most of the feet (PL xli., figs. 



72-74). 



Owing to the golden colour of the spine it is difficult to 

 detect on the worm under a dissecting lens, and thus difficult 

 to state quite definitely the segment on Avhich it occurs (but 

 as this may vary, see above for E. pycnobrancliiata] . In this 

 specimen it is not present on the thirty-sixth, but is on the 

 fortieth segment ; in another individual I find it in the 

 thirty-sixth ; in a trird in the thirty-eighth. 



The jaws. The lower jaws have large thick white plates 

 at the distal end, which are irregularly undulating at the 

 free edge, so as to form three projections of irregular size 

 (PI. xlii., fig. 77). 



The upper jaws are dark brown, but in smaller specimens 

 a paler brown ; the tip of the "forceps," and of the various 

 denticulations of the other sclerites, are white and calcified. 



The forceps (zange) are slender, with the tip curved 

 upwards (PI. xlii., fig. 76). The artknilatioii between forceps 

 and its carrier is marked by a dark brown band, which is 

 very conspicuous when the jaws are of the paler tint. 



The left dental plate (jawlets of the second parr) (II.), has 

 4 teeth, the distal largets, the others decreasing proximally 

 (PI. xlii., fig. 75). 



