6 Prof. M‘Intosh’s Notes from the 
between the bristle-tufts. Through the translucent posterior 
region a moniliform alimentary canal passes backward to the 
fissure between the caudal cones. 
The bristles, of which there are about thirty-three pairs 
on each side, are pale, though in the sun they sparkle with 
metallic lustre, and are all directed forward—a feature most 
boldly marked in the longer anterior forms, which, moreover, 
are arranged in a dorsal and a ventral tuft. The first 
bristles are close to the small median cephalic area, and 
consist of a dorsal and a ventral series, with a clavate or 
pear-shaped papilla (Pl. I. fig. 8) between them. Each has 
three strong curved bristles, the stoutest with a terminal 
curve or hook directed outward (Pl. LI. fig. 5 and Pl. III. 
fig. 2) and two or three others (PI. I. fig. 7) more or less 
hooked, but differently from the former, so that they 
present irregularity in this respect. ‘The first five feet have 
the strougest bristles, those which follow have longer 
bristles without a hook at the tip, though slightly curved. 
The posterior bristles (Pl. II. fig. 6) are shorter and more 
slender. 
The accompanying tube (PI. II. figs. 7 & 8) is firm and 
hard, composed of brownish grains of sand, dotted all over 
with black particles. It is somewhat rough externally, but 
perfectly smooth internally, the mucoid lining presenting a 
finely granular aspect with broken fibres and reticulated 
structures like the tests of Diatoms and Radiolarians. The 
innumerable broken fibres may be connected with Rhizo- 
solenia, Such may have readily collected on the mucoid 
surface during the feeding of the animal. 
The strong simple bristles of this peculiar form recall 
those of the Oligocheets or the anterior bristles of Sclerocheilus 
—indeed, the Scalibragmide are characterised by the sim- 
plicity of their bristles and the reduction of the prostomium ; 
but their outline differs much from that of Fauveliopsis, and 
they do not dwell in tubes. The bristles of this new species 
offer, both in their structure and distribution, a rare condition 
in the Polychets. The strongly hooked anterior forms are 
evidently fitted for action in the soft ooze, the more slender 
types posteriorly probably being useful during the move- 
ments in the tube. Bereft of tentacles, as in Myriochele, 
another deep-sea form, both are tubicolar. The mouth-parts 
are akin to those of rada, and the anterior segmentation 
is as distinct as that of the posterior region in Trophonia 
glauca, Mgrn., whilst the brittle refractive bristles approach 
those of this family (Chloreemidx) in general structure, 
though not transversely striated. Whilst it bears certain 
