26 Prof. M‘Intosh’s Notes from 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) being 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 coneluding the specially differentiated 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, appa- 
rently along the intestine, probably from an intestinal sinus, 
and thereafter the reddish hue is due to the Jongitudinal 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 papillz 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. 
In Petaloprocius terricola, De Quatrefages, another addi- 
tion, the head is fused with the buccal segment and without 
a marginal ridge. Body about 18cm. long, 2-3 mm. broad, 
and of twenty-four segments, twenty-two of which are seti- 
gerous. First segment distinctly separated from the buccal. 
First three segments have no ventral division. In the 
others there are two ventral tori, each with about forty 
crotchets. Dorsal bristles strong, yellow, and winged, and 
others colourless, not winged, spinous. Behind the sixth or 
seventh segment are capillary bristles, sinuous and long 
(overlooked by Claparéde and Grube) with minute spines. 
In seven or eight posterior segments in front of the anal, 
* Proceed. Roy. trish Acad. vol. xxix. no. 6, p. 219. 
