214 " ENDEAVOUR " SCIENTIFIC RESULTS. 



character is not evident, the brown rings exist. The median 

 tentacle has, in this case, 18 sweUings, the admedian 16, and 

 the lateral 8, and the length of the three has the same pro- 

 portion ; but in one other I noted 13, 10, and 8 respectively. 

 It is likely that the tips are fragile, so that this detail and 

 the relative lengths in regard to the number of segments, 

 such as it is sometimes the custom to give for species of 

 Eunice, has little importance, as Crossland has already re- 

 marked. 



The palp is divided horizontally into a smaller upper lobe 

 and a larger lower lobe. 



The peristomium is as long as the nuchal and the first two 

 chsetigerous segments together ; its diameter is 6 mm. and 

 is much more than its length. The upper lateral edge of the 

 lower lip is, as M'Intosh stated and figured, prominent and 

 visible from above as it is separated from the side of the 

 peristomium by a deeper notch than is usual in the genus 

 (PI. xlii., fig. 80). 



The nuchal cirri are indistinctly moniliform, having about 

 eight rings ; generally they do not quite reach the anterior 

 margin of the peristomium. 



There is a pair of smooth subanal cirri equallmg in length 

 the last 10 segments. 



The dorsal cirri are not annulated, but are irregularly 

 constricted, especially in the anterior feet, in which they 

 are of larger size than further back. Under a lens they have 

 the appearance of annulation, but microscopic study shows 

 that this is merely a result of muscular constriction ; while 

 it may be noted, by a comparison of successive cirri or of 

 cirri on opposite sides of the body in the same segment, that 

 these constrictions are quite irregular in their spacing and 

 in their number. In the figure illustrating M'Intosh's 

 account (PI. xxxix., fig. 13) the cirri are shown annulated, but 

 in that of the foot (figs. 14, 15) these annuli are not repre- 

 sented. 



The gills in this individual commence on the fifth chati- 

 gerous segment.! 



In the fifth there is but one filament, that is the axis of the 

 future gill ; on the seventh, there are four filaments ; the 

 maximum number is reached on the 10th, with six filaments ; 

 the lowest being here longer than the dorsal cirrus. This 



1. I use the word "segment" always as meaning a " chajtigerous 

 segment," and exclude from the enumeration of segments the two first 

 segments, the peri£,»tomial and nuchal. 



