fig. 5). The tentacular cirri are similar. The dorsal cirri increase in size, but have the
same structure. In all these, minute rounded glands (like papillge) are dotted over the
granular layer of the’ epiderm, and may be associated with sensation. They are quite
beneath the cuticle, which is somewhat dense. At the tip or bulbous part of the
appendix the cuticle is thin, so that the nervous expansion comes close to the surface.
Body.—About two inches long, large specimens being two and a quarter inches (De
Quatrefages), and is covered dorsally by the fifteen pairs of scales, which largely overlap.
They vary in tint from pale to dark brown, with a slightly iridescent purplish sheen,
and are firmly fixed by their pedicles near the middle of the external border. Under a
moderate power they present a fibrillar or cordate structure, and the exposed surface has
a series of minute papilla, the anterior region alone being devoid of them. The edge is
smooth. The first pair are small, and have the scar for the attachment of the pedicle
near the centre. They again diminish posteriorly, but the structure remains the same.
The Mediterranean forms are generally darker than those from the Channel Islands.
The ventral surface of the body is covered with a firm cuticle studded with minute
papillas, which are slightly brownish, especially on the feet at the commencement of the
posterior third. Anteriorly the buccal fold forms a broad, rounded, finely grooved flap,
diminishing to a nearly cylindrical ridge posteriorly. The minute papillge are numerous
on the edges of the buccal fold. A median and two lateral ridges flanked by the feet
characterise this surface, as in allied members of the group.
The segmental papillm commence on the eighth foot, and continue to the twenty-
ninth, that is, about the fourth foot from the tip.
The papillae of the proboscis are, like the others, somewhat dichotomous in their
division (Plate XXXVII, fig. 4), the tips of many of the processes being broadly and
more or less symmetrically lobate, or having a process at one side so as to be pedate.
They seem to be flattened, and thus in the preparations do not readily separate from each
other. They differ much in outline from the same processes in Laetmatonice filicomis.
The dorsum is flanked by the lustrous brown spines (Plate XXXVI, fig. 11), which
are directed backwards and slightly outwards. In some views they are brownish, while
in others they have a rich golden sheen. Anteriorly the granular spines stand upwards
with the curve directed towards the middle line, the inner bristles spreading over the
dorsum. The lateral brush, again, on the cirrus-bearing foot is directed outwards and
with a backward curve. As soon as the Tong spines become prominent the pedicle for
the scales causes a radiate arrangement of the stiff tapering bristles (Plate XXXVI,
fig- 9), which spread over the dorsum and meet those of the opposite side in a symmetrical
and graceful manner. The outer bristles of this series are more erect; the inner are
adpressed, so as to guard the scales. These bristles are of a rich golden colour, with
pale tips.
Three recurved fangs, as a rule, occur on each side of the tip of the spines (Plate
XXXVI, figs. 12, 14, and 15), besides the smaller pair at the angle of the spear-tip.
They are more nearly opposite (though the last two are not so) than in Laetmatonice
filicomis.
J ’eeiSThe first foot has pale, simple bristles, the tufts being directed forwards and
inwards, and the basal portions of the tentacular cirri are warty like the tentacle.
The second foot has dorsally a tuft of pinnately spinous bristles as in the other
members of the group, for instance, A. aculeata,—little variation occurring in the species.
In the ventral branch are two bristles (Plate XXXVII, figs. 6 and 7), an upper with
a strongly spinose edge above the powerful tooth, and a lower with indications of four
spines, viz. the usual powerful inferior one, the : somewhat less spine above it, and
indications of two others beyond, the last being slightly developed. The foot has
numerous globular papillm on its surface.
Thé third foot, which carries a cirrus, has dorsally and internally a series of
powerful bristles minutely nodular (Plate XXXVI, fig. 9), and with a well-marked curve,
while externally a group of smaller forms of a similar kind occurs. This nodular
development on the surface is peculiar, and forms a swelling below the tip as
if it were a secondary development. The prominent granules or minute nodules
are not affected by potash. The ventral division has often stout bristles with the
spinose tips above the powerful fang, as shown in Plate XXXVII, figs. 6- and 7 before
mentioned; but in some the spines above the fang are only four in number, while
in others they are eleven. At the ventral edge of this division of the foot are
numerous pinnately spinous bristles, as indicated in the dorsal division of the second
foot.
In the fourth (a scale-bearing foot) the dorsal bristles are still curved, and occasionally
minutely nodular, but much longer than in the third, and the tips of some are
shaped as in the hooked forms. A few shorter and straighter spines occur externally.
.Ventrally the powerful bristles still show-spinose tips, but the spines above the inferior
fang are diminishing in number, one having only two.
The fifth (likewise a scale-bearing foot) has dorsally the somewhat broad, granular
bristles, the tips of the amber-coloured ventral still having spines, the number of the
latter above the great fang from above downwards in the three bristles present in the
example being two, three, five.
The sixth foot (cirrus-bearing) has dorsally short, curved, and slightly granular
flattened bristles dorsally and internally; externally a shorter and more slender form of
similar character. Ventrally three bristles occur, with two, two, and three spines above
the great fang.
The seventh foot has numerous curved, granular bristles dorsally, besides the spines,
some with greatly elongated tips, which, moreover, are somewhat hastate. On the
ventral bristles only two spines in all are present above the fang.
In the eighth foot (cirrus-bearing) the dorsal bristles are curved and granular, with
a tuft of longer and more slender bristles to the exterior (below the cirrus). The three
ventral bristles had each two spines above the fang. The segmental (nephridial) papilla
begins on the posterior border of this foot, completely hidden in the fissure between it
and the next foot.
Dorsally in the ninth foot were numerous curved granular bristles with somewhat
blunt tips. Beyond these stretch the long characteristic brown spines with the glochidi-
ate tips. Ventrally the three bristles have from above downwards one spine above the
fang, two and one. Their shafts are strongly grooved.
The tenth (a cirrus-bearing foot) has dorsally the shorter curved granular spines,