1912. Pectinariaielgica, Wollebisk. Skriv. Viil.-selsk. Krist., No. 18, p. 89, pi. Hi, %s. 9—11.
„ „ c, „ A. H. 'Meyer. Inaug. Dissert. Kiel., p. 10.
1914. „ „ Soutliern. Proc. Roy. Irish Acad., rol. xxxi, No. 47, p. 130.
n M „ McIntosh. Ann. Nat. Hist., ser. 8, vol. xiii, p. 84.
1917. „ ., / \Hessle. Zool. Bidr. Uppsala, 5, p. 75.
Habitat.—Off the Hebrides, July, 1868 ~(Dr. Gwyn Jeffreys)J Loch Linnhe, off
Castle Walker; “ Knight Errant,” 1882 (Sir John Murray); Berehaven, Ireland, Royal
Irish Academy’s Expedition, 1885 (Prof. A. C. Haddon); large tube ? off the Bell Rock,
St. Andrews (W. C. M.); Dublin Bay and Killary Harbour. (Southern); Plymouth
(Spence Bate and Brooking Rowe).
Abroad it extends to Sweden; Finraark (Norman); Magellan (Ehlers); Belgium
(Pallas?).
The crown in this species has ten to fourteen paleolaa, which are broader than those
of Lagis Koreni, and, as P. belgica is often larger, they are stronger and more individualised,
but their curves are similar, the convexity being ventral. They dilate a little
above the base and then taper to a very delicate, hair-like tip, which from the lines at its
sides would seem to indicate relationship with a winged bristle. Friction, however,
removes the delicate extremity in some. The outer paleola is shorter than the adjoining
one, whilst the two inner appear also to be smaller in most examples. In the largest
example from British waters in the collection, viz., from Loch Linnhe, fourteen paleolae
occurred on the left and ten on the right. Above the paleolm is the tough, firm and
slightly corrugated surface of the crown, which has a proportionally broader rim than in
L. Koreni. Having reached its greatest diameter laterally it curves ventrally a little
within the edge of the paleola), and ends at the long anterior cirrus. The margin
dorsally and laterally is smooth, but on the ventral curve to the paleolse it has one or two
small papilla). After the cirrus the edge slopes backward to form the pillars at the sides
of the mouth.
The veil is more restricted than in any of the allied forms, and its outline is fanshaped,
the anterior edge having ten or eleven rather large tapered papillae or fimbriae
and the edges a few others as they pass to the anterior regiou of the mouth.
The tentacles arise immediately behind the veil, and form a considerable group on
each side. They have the usual shape, and the extremities in the preparations, as in life,
are often clavate. Numerous smaller forms occur posteriorly, and all are attached to a
surface continuous with, and forming part of, the veil, and these are in front of the mouth
dorsally. The small lateral fold of the veil to a certain extent forms a guard antero-
laterally. A broad fillet occurs on each side of the mouth posteriorly, and a median fold
completes it behind.
The second cirrus arises laterally a little behind the margin of the crown and is a long
subulate tapering organ. A ridge passes ventrally from it on each side, meeting its fellow
in the middle line behind the mouth, and may be taken to represent a segment. The
next two are branchial segments, each having the typical branchia of the group, viz. a
series of flat lamella) largest internally and diminishing externally, attached to the
basal and posterior stem. The second is smaller, but of similar structure. These
two segments are glandular ventrally, and in the centre of each is a median fold
or boss.
The next region of the body, which is smoothly rounded dorsally, flattened and
grooved ventrally, consists of three bristled segments devoid of hooks. The first two are
highly glandular ventrally from side to side, and with the median fold, whilst the
third is apparently only partly so, being continued ventrally as a transversely folded
band with a slight median differentiation. The bristles in these are typical, viz. strong,
with tapering tips (Plate CXXIV, fig. 1), which show traces of wings, and those with the
spear-head dilatation and the long hair-like tips, the edge being serrated.
The succeeding region of the body still remains smoothly rounded dorsally, but
ventrally it has throughout the five or six anterior segments? a fusiform area in the centre,
apparently a special glandular region. At each side ventrally in a line with the lamella)
is a short glandular patch, which diminishes as the segments go backward. The
ventral surface generally is flattened and grooved posteriorly. This region has fourteen
pairs of dorsal bristle-bundles attached to the dorsal edges of the lamella) bearing
the rows of hooks. The bristles are stout, simple, with tapering tips which have
traces of wings (Plate CXXIV, fig. 1), besides those with spear-shaped dilatations,
serrated edges, and long tapering tips. The tufts are smaller posteriorly, but do not
differ in structure.
Each of the hooks (Plate CXXIV, fig. 1 a) presents seven teeth below the crown;
then follows a process with minute teeth, the trend of which is from above obliquely
outward, whilst the prow inferiorly is bluntly conical. The shaft of the hook is short and
bent nearly, at a right angle. In Malmgren’s figure of the hook the minute teeth above
the prow cover a longer space—that is, are more numerous than in the specimens from
Britain. The prow, both in this species and in Amphictene auricoma, often presents a
slightly double tip as if not smoothly rounded.
The tortoise-shaped caudal process is usually bent at more than a right angle to the
dorsum, thus making a small angle with the ventral surface. The rudimentary feet pass
obliquely upward to the dorsal keel, toward the end of which is on each side a considerable
row of caudal hooks. The dorsal surface of the process is flatter than in allied
forms, a median keel and symmetrically arranged transverse ridges being on this surface.
The rim is not much elevated, and has two notches beyond the hooks and in some a
minute papilla or two. The caudal hooks (Plate CXXIV, fig. 1 b) differ from those of
any other form, having a comparatively straight shaft tapering toward the neck, which
bends a little backward and then gently forward at the tip, so as to form a strong point.
As usual the shaft is longitudinally striated.
The tube is large, nearly straight, and tapered to a small extremity. Moreover it is
lined in some by a comparatively thick internal membrane which readily separates in the
preparations from the firm wall. Its masonry as a rule differs from that of Lagis or
Amphictene in so far as the grains are smaller, and even though in some the surface is
rendered irregular by projecting larger grains, the general effect is characteristic. Typical
examples on sandy ground are smooth and finely grained, no separate joints being
distinguishable (Plate CXVIII, fig. 4 a).
On a large example dredged by the ** Knight Errant5 in Loch Linnhe off Castle
175