vessels passing from the ventral vessel to the intestine. In the anterior region the
dorsal vessel is represented by a perienteric sinus, and this anteriorly opens into a free
dorsal contractile heart with a cardiac body.
Ssolowiew (1899), in his “ Terebellids of the White Sea,”1 makes Amphitrite johnstoni
fall under Amphitrite brunnea of Stimpson, as also does Marenzeller.
In the collection in the British Museum, Terebella constrictor, according to Malmgren,
is T. debilis, = figulus, = Johnstoni, but the title is on several bottles containing other forms,
such as Ni-colea, Leprea and Amphitrite scylla.
6. A m p h it r it e scylla, Savigny, 1820. Plate CXIII, fig. 2—body; Plate CXXVa,
figs. 2—2 c—bristles and hooks.
Specific Characters,—Cephalic collar forms a small rim posteriorly, and passes to
join the edge of the supra-oral arch. Tentacles numerous, of a pale cream colour. Front
edge ends in a prominent spout-shaped arch over the mouth. Lower lip formed by a
transverse fold, and within it is a small tongue-like eminence. Body proportionally long
and slender, segments 115—150, pale cream-coloured enlivened by blood-vessels, and the
brownish-red specks posteriorly. The enlarged anterior region has a close series of
transverse ridges minutely tessellated from -isolated glandular masses. The anus has
marginal papillæ. Scutes occupy about twelve segments in front with several narrow
rings ; the posterior region is marked only by the segment-junctions. Branchiae two pairs,
the first and larger pair on the second segment. Each springs from a short stem, which
rapidly, gives off four main divisions, splitting up into a dense arbuscle with short
terminal branches. The second pair is on the next segment. Occasionally a specimen
has three branchiae on one side and two on the other, the third being a small independent
stem behind the second. Setigerous processes twenty pairs (Yon Marenzeller gives seventeen
to nineteen), and in addition a small conical papilla under the second branchia, and
conspicuous papillae on segments 6—13. The longer bristles have winged tips with a
characteristic expansion at the base, and are narrow distally. The shorter bristles have
peculiarly curved tapering tips without distinct wings. Hooks commence at the third
setigerous process, the first being distinguished by the large size of the main fang and
the comparatively small size and oblique nature of the base. By-and-by they form a
double row and become typical, the great fang being proportionally smaller, the base less
elongated, and the lower edge more convex. In a double row from segment'll, in a
single row posteriorly. Body in front of a dull reddish colour, becoming paler behind the
anterior region and ventrally ; posteriorly of a pale straw or almost whitish hue marked
by the dull grey contënts of the intestine. The branchiæ, which have tapered tips, are
bright red, and are in constant movement with the tentacles when the animal is removed
from its tube. The tentacles are pale yellow (straw colour), the tips being more opaque.
By flattening out at any part of their length they can attach themselves to the surface of
the glass. Some specimens have brownish-red pigment-specks toward the posterior end ;
others are dull orange anteriorly, pale and translucent posteriorly. Inhabits tunnels in
fissures of rocks. 1 ‘ Ann. Musé. e Zool. St. Petersb./ p. 202. .
Synonyms.
1820.
1826.
1828.
1836-
1843-
•1851.
1860.
1862.
1865.
1868
1875.
1884.
1885.
1893.
1894.
1897.
1900.
1901.
1904.
1906.
1909.
1914.
1915.
Terebella scylla, Savigny. Syst. Annel., p. 87.
;. ' „ varidbilis, Risso. Hist. nat. L’Europe Merid., vol. iv, p. 408.
scylla, De Blainvil^ Diet. So. nat.,. t. lvii, p. 438.
49: ,,' varidbilis, Cuvier. Reg. An., Illust. Edit., p. 25.
S3. ,, ' Chenu. Illust. Conch., IIe livr., pi. iv, fig. 6.
• scylla, Grube. Fam. Annel., pp. 80 and 138.
„ gracilis, idem. Arch. f. Naturges., Bd. xxvi, p. 99.
„ gelatinosa, Keferstein. Zeitschr. f. w. Zool., Bd. xii, p. 126, Taf. xi, figs. 19—22.
Physelia scylla, De Quatrefages. Annel., tom. ii, p. 369.
gracilis, idem. Ibid., p. 372.
?. Terebella lævirostris, Claparède. Annél. Nap., p. 139, pi. xi, fig. 5.
Nicolea gelatinosa, Grube. Abh. Schles. Ges., 1868—69, p. 128.
Terebella lævirostris, Panceri. Atti S og. Ital., vol. xviii, p. 530.
Amphitrite gracilis, Marenzeller. Sitzb. der K. Akad. wissensch. Wien, sep. abdr., p. 26,
Taf. i, fig. 3.
. „ „ Carus. Fauna Medit., i, p. 262.
„ varidbilis, Lo Bianco. Atti R. Accad. Sc. Napoli, vol. v, Nö. 11, p. 50.
„ gracilis, De St. Joseph. Ann. Sc. nat., 7® sér., t. xvii, p. 198, pi. viii, fig. 234.
' » Michaelsen. Polych. deutsch. Meere., p. 168.
,, varidbilis, Elders. Magell. Annel., p. 15.
: „ idem. Polych. Magell. u. Chil., p. 208. -
,, „ gracilis, Journ. M. B. A., vol. vii, p. 228.
» « Bohn. Ann. Sc. nat., 9e sér., t. iii, p. 121 (movements).
• d ~ varidbilis, Lo Bianco. Mitt. Zool. St. Neap., Bd. xix, p. 576.
» gracilis, Southern. .Proc. Roy. Irish Acad., volV xxxi, No. 47; p. 122.
'.ft « McIntosh. Ann. Nat. Hist., ser. 8, vol. xv,- p. 9.
» „ Allen. Journ. M. B. A., vol. x, p. 633.
» ,, Southern. Irish Sc. Invest., No. 3, p. 46.
„ „ Rioja. Anél. Poliq. Cantab., p. 49.
» ,, Hessle. Zool. Bidr. Uppsala, Bd. v, p. 190.
Habitat.—Abundant in fissures of the gneiss rocks amongst sandy mud and gravel
at St. Peter Port, Guernsey, and also between tide-marks in Herm. Polperro, Cornwall
(Dr. Baird); Southport (Dr. Carrington); several examples in the Collection of the
British Museum unnamed; Falmouth; Plymouth (Allen); Blacksod Bay (Southern).
Abroad it is found in the Red Sea (Savigny) ; Sicily (Grube, V. Carus) ; shores of
France (De Quatrefages, Keferstein, De St. Joseph); Mediterranean and Adriatic
(Claparède, Von Marenzeller) ; Cantabria (Rioja).
The dorsal cephalic collar, in this really the border of the cephalic plate, forms
a small crenated rim posteriorly, and passes downward at each side to join the lower
edge of the supra-oral arch. The tentacles which take origin from the plate are
numerous and have the typical grooved structure. They are of a pale cream colour
and partly translucent. Its front edge terminates in a prominent spout-shaped arch
over the mouth, the sides inferiorly .sloping obliquely to their attachment. The lower
lip is formed by a transverse fold, and within it is a small tongue-like fold or