180 Prof. M‘Intosh’s Notes from the 
grooved ventrally. The anterior region consists of six 
bristled segments * and the fused peristomial segment, thus 
differing from Serpula and Hydroides in the absence of the 
conspicuous first pair of bristles on the dorsal edge of the 
fused collar and alar membrane. The alar membrane passes 
backward above the bristles, the sides separating as they go 
to fuse with each other as a broad thin flap on the ventral 
surface behind the anterior region. Anteriorly it and the 
collar are yellowish externally and bluish internally, and the 
bluish colour appears laterally and posteriorly. The posterior 
region has sixty to seventy segments. All the bristles are 
directed upward and backward as pale golden flattened 
tufts, and the structure is the same throughout this region. 
Each bristle has a translucent and nearly cylindrical shaft 
with a slight curvature toward the commencement of the 
tapering tip, which has two narrow wings so arranged that 
in certain views the space between them seems to be 
hollowed out. The dorsum anteriorly is pale brown or 
purplish brown, whilst the general colour posteriorly is dull 
yellow with pink lateral regions. 
‘he posterior bristles have slender cylindrical shafts, 
which diminish and then dilate superiorly as they approach 
the broad shoulder, the spinous distal edge of which has a 
concavity trending on one side to a delicately tapered whip. 
This peculiar tip would seem to combine the functions of 
the long simple and the brush-shaped bristles of other forms. 
The anterior bristles have a proportionally short hold of 
the tissues, a feature of importance in connection with the 
habits of the annelid, and, whilst they point upward and 
backward, the posterior are directed transversely or ventrally 
and slightly forward. In each case the bristles are at the 
end of the rows of hooks—the antericr at the dorsal end, 
and the posterior at the ventral end. 
The alimentary canal appears to be similar to that of 
Sabella, forming a moniliform duct, wide anteriorly and 
diminishing posteriorly. It is coated with nucleated cells 
externally. 
The ccelomic corpuscles are large and round. 
A yellowish coiled gland (nephridium ?) occurs anteriorly, 
external to the gut and adhering to the body-wall. Its 
structure is granular. 
De St. Joseph found Protozoa apparently referable to 
Anoplophyra, Stein, in the intestine. 
* De St. Joseph states that there are seven, but six only occur in 
Britain. 
