belt runs from this forward in the median line to the base of the tentacle, which is
blackish ; and the anterior areas of the head thus mapped off are brownish red, with dark
grains along the edges. The anterior pair of eyes are lateral, lying in front of the
brownish-red border of the region. The posterior pair are large, black, widely separated,
and situated on the pale band of the region. The median tentacle is absent. The
lateral tentacles are short, brownish at the base, with a filiform tip, and furnished with
long clavate cilia. The palpi have a dense series of minute papillae, with enlarged tips.
The tentacular cirri have a blackish patch at the base, a light brownish one in the
slightly dilated portion near the tip, then a whitish ring, and lastly, a dark brownish
one at the base of the filiform termination. They possess long cilia with globular ends.
' Body.-—The body is typical, that is, slightly narrowed in front, more so posteriorly,
about 13 mm. in length, and mottled with blackish pigment on the dorsum in a
remarkable way. The dorsum of the first four segments is mainly blackish, then each
segment presents near the posterior border a median bar, which by-and-by becomes a
speck. Symmetrical touches of pigment mark the lateral regions of each segment, and
two blackish specks occur on the base of-the foot. A well-marked median band of
black characterises the dorsal lip ; the ventral surface is otherwise pale. The pale scale-
pedicles are very distinct, and proportionally large.
The dorsal cirri agree in colour with the tentacular cirri, and besides the longer cilia
with globular ends on the column of the organ, shorter cilia proceed upwards rather
beyond the lower third of the extremity. The ventral cirrus is subulate, with sparsely
distributed and short clavate papillæ. The first has a dense-coating of cilia, with large
globular tips.
Scales (Plate XXXII, fig. 6) probably fifteen in number, though the last pair
had disappeared in the specimen. The first pair are rounded, densely spinous, and
ciliated almost entirely round ; the cilia being longest externally, and with characteristic
globular ends. The rest of the scales are more or less reniform, becoming ovate posteriorly.
The general colour of the scales is dark greyish with a blackish patch in the
centre, the pigment being broken into fragmentary portions. The outer and posterior
edge is ciliated, as indeed is the greater part of the circumference. They commence as
short, almost baccate processes, and towards the outer edge are more elongate, the
extremities being nearly globular, the series again diminishing to terminate in short
papillæ.'- With the exception of the covered portion of the scale the surface is densely
covered with minute and rather blunt spines, a few of which towards the outer and
posterior edge become larger acute processes, or bluntly conical papillæ. A considerable
portion of the inner region of the scale is curiously reticulated, so that the spines are
grouped in areas- a condition visible under the lens as well as the microscope over the
greater part of the scale. The anterior and outer border has larger spines than those
on the general surface, as shown in the figure. From the extreme roughness of the scale,
mud and débris lodge in the crevices.
Feet.—The firstfoot has two curved bristles which correspond in structure to the
dorsal type, though the smooth tips are somewhat broader.
The dorsal bristles of the second foot are nearly typical, except that the smooth tips
are larger. The ventral are more slender than the subsequent forms, but show a bifid tip.
The dorsal division in the typical foot bears a somewhat dense mass of rather short
pale bristles with a slight curvature. The tips are short and by no means acute
(Plate XXXYIII, fig. 4, representing one of the longer forms). The spinous rows are
much more distinct and longer than in Lagisca Jloccosa, and the shape of the bristle
differs. The ventral division has translucent bristles with moderately long shafts. The
tips of the superior series (Plate XXXYIII, fig. 5) are long and somewhat tapered, with
rather distant rows of long spines, the smooth terminal region being minutely bifid.
The tips gradually become shorter and stouter inferiorly (Plate XXXYIII, fig. 6), the
strongly curved terminal hook and the secondary process with its characteristic angle
of incidence being noteworthy. Some of the latter bristles show traces of an outward
curve between the secondary process and the first row of spines. Towards the ventral
border thé secondary process diminishes with the general size of the bristle, but a
minute trace occurs in almost all.
The dorsal bristles in most feet are densely coated with débris and minute
filamentous algoid growths, and in some cases the tips of the ventral are likewise
encrusted with a parasitic structure showing minute rods.
This species approaches the Polynoë aspera of Hansen1 from the Norwegian North
Atlantic Expedition, and of Théel,3 from Nova Zembla, but differs in regard to the palpi,
which are smooth in the northern form, and also in the shorter tips (bare) to the dorsal
bristles. . It may be that further examination will show they are identical.
3. Lagisca J effreys!!,3 n. s.
Specific Characters.—Length 16 mm. or more. Head more elongate than in Lagisca
jloccosa, with blunt anterior peaks. Posterior pair of eyes just in front of the collar,
anterior pair somewhat further forward than in L. jloccosa, and lateral in position.
Median tentacle absent; lateral subulate, and slightly beneath the base of the former.
Tentacular cirri slender, and with a series of clavate cilia which commence only when
the basal third of the process is reached. Palpi have rows of minute papillae with
nodular, tips. First scales rounded and minutely spinous, rest ovate-reniform, with a
distinct fold from the scar of attachment to the hilus at the anterior border, speckled
throughout the posterior half with pale specks as if variolated. The outer border has
long cilia. Dorsal bristles of moderate length, with well-marked spinous rows, and a
very short smooth tip. They are nearly straight. Yentral bristles with rather short
spinous rows, and a short bare tip with a strongly curved hook at the end, and a
secondary process—directed nearly straight—distally. Ventral cirrus with clavate cilia.
Habitat.—Dredged in sixty fathoms, nine miles off Balta, in 1868, by Dr. Gwyn
Jeffreys.
1 ‘Nat. Mag. f. Naturvid./ 24, p. 4, 1877, and ‘Norsk. Nordh. Exped.,’ vii, p. 5, pi. ii, f. 11—
15, 1882.
2 ‘ Annel. N. Zemb./ p. 10, pi. i, f. 1—4, 1879.
3 After the late Dr. Gwyn Jeffreys, a veteran explorer of the Zetlandic seas. The name was
formerly given to the succeeding speoies—now associated with P. extenuata, Grube.