CAISICIRRUS NEGLECTUS. 495 
C&SICIRRUS NEGLECTUS, Arwidsson (= PSEUDOCLYMENE @RSTEDI, Claparede). 
All that is known of the coloration of this (by no means uncommon) species is the remark 
by Cunningham and Ramage! in their “ Polychet Fauna of the Firth of Forth,” that in 
their “Axiothea catenata the colour is pinkish, pale towards the anterior end, with broad 
bands surrounding the body at intervals.” The region whence these authors drew their 
supply has since altered its character, probably from pollution, so that a careful search was 
unsuccessful. It lives gregariously in tubes of sand-particles sunk im the sand. In 
examples from Wales? the anterior end of the annelid is somewhat pale, though the median 
vessel causes a streak along the dorsum, the blood at the same time tinting the cephalic 
plate. In front of the third bristle-tuft the region has a smooth and glistening cuticular 
coat, which is iridescent, and at the segment-junction in front of the tuft (third) a faint 
reddish belt apparently from a blood-vessel occurs. ‘The next segment-junction has a belt 
of red on each side of it, apparently of reddish pigment, the specks of which pass a short 
way on the following segment (fifth bristled), which has its bristle-tuft about the middle. 
Then there is a slight constriction of the body-wall, at which a broad red belt occurs, a bristle- 
tuft (sixth) bemg placed just in front of another red belt, which passes all round the body. 
The next bristle-tuft (seventh) is in front of a furrow, marking another segment, the anterior 
third of which has the broadest band of red yet met with in front. This is followed by a 
pale region ending at the next bristle-tuft (eighth), and concluding the specially differen- 
tiated region anteriorly, the seventh and eighth tufts being separated by a long interval. 
The next segment and half of the following are coloured, except at the margins, by a 
longitudinal belt of red, apparently along the intestine, probably from an intestinal sinus, 
and thereafter the reddish hue is due to the longitudinal and circular vessels, especially 
those of the gut, the tip of the tail and its cirri being pale. In these examples the majority 
of the short anal cirri had processes at the tip, as Arwidsson shows in his figure’ and describes 
as “short, finger-like lobes,” some being only bifid, others trifid or quadrifid, whilst each 
of the processes in a bifid form may have two or more minor papille at the tip. Occasionally 
the cirrus ends in a bluntly conical apex with a minute papilla at each side near the apex. 
The gut itself is yellowish or pale orange. 
The proboscis, which is constantly protruded by the animal when removed from its 
tube, shows a tinge of red from a blood-vessel along the middle, and its distal region appears 
to be smooth. 
The exact position of this form has been for some time open to doubt, and I agree with 
Prof. Fauvel, who, from an ample supply of living specimens on the French coast, has 
ascertained that “it is nothing else than the old and well-known Clymene ecrstedi of 
Claparede.” The identity of the anterior and posterior ends and of the bristles and hooks 
of the two forms is obvious on contrasting them in the respective plates. 
1 «Trans. Roy. Soc. Hdin.,’ vol. xxxii, p. 679, etc., 1888. 
2 T am indebted to Mr. Arnold Watson for hving examples. 
3 “Proc. Roy. Irish Acad.,? vol. xxix, No. 6, p. 129. 
