branchiae, the posterior nearer each other than the anterior. Body enlarged anteriorly,
tapered posteriorly, sometimes spindle-shaped, the anus having two cirri. Length § to 1
inch and with sixty-five to seventy segments. General colour blood-red, darker anteriorly,
paler posteriorly. The lip is rich red, lateral flaps translucent. Three pairs of filiform
branchiae on segments 2, 3 and 4, often contorted and spiral.- Setigerous processes fifteen,
commencing on the sixth segment. Bristles simple, of moderate length, and with
narrow wings on the tapei'ing curved tips. The same segments bear hooks with
elongated and curved shafts. Uncinigerous processes only are present behind the
bristled region. They are flattened and slightly enlarged at the tip. Avicular hooks of
this region minute, with short bases, a moderate main fang and four to five large teeth
above it. Posterior segments forty to fifty. Nephridia in third, fourth, fifth, sixth and
seventh segments. Tube fragile, delicate, formed of minute grains of sand.
Synonyms.
1866.
1867.
1869.
1874.
1875.
1878.
1879.
1881.
1883.
1884.
1887.
1893.
1894.
1896.
1897.
1898.
1899.
1900.
1901.
1909.
1912.
1913.
1914.
1915.
1917.
Trichobranchus glacial/is, Malmgren. Nord. Hafs.-Annul., p. 395, Tab. xxiv, fig. 65.
,>L „ idem. Annul. Polych., p. 112.
„ „ McIntosh. Trans. Roy. Soc. Edin., vol. xxv, p. 425, pi. xvi, figs. 6—8.
„ Malm. Annul. Göteb., p. 99.
„ „ Marion. Rev. Sc. nat., t. iv, p. 309.
» „ McIntosh. Trans. Linn. Soc., ser. 2, Zool., p. 508.
'.I y,: ’ - „ Tauber.- Annul. Danica, p. 135.
„ „ Vei-rill. Proc. U.S. Nat. Mus., vol. ii, p. 181.
,, - „ Théel. Kgl. Svensk. Vet.-Akad. Handl., Bd. xvi, p. 64.
„ „ Langerhans. Canarische Annel., p. 117.
,, . ,, Levinsen. Vidensk. Meddel. for 1883,.p. 176.
• „ . ,, . Webster and Benedict. Rep. U.S. Com. F. & F., p. 735.
„ „ Langerhans. Zeitschr. f. wiss. Zool., Bd. xl, p. 262.
„ „ Meyer. Mittli. Zool. Stat. Neap., Bd. vii, pp. 634, 636.
„ „ Webster. Cliæt. Eastport, Maine, U.S. Com. F. & F., p. 750.
,, >, Lo Bianco. Atti R. Accad. Sc. Nap., vol. v, No. 11, p. 58.
„ „ Dé St. Joseph. Ann. Sc. nat., 7e sér., xvii, p. 244, pi. x, figs. 275—278.
„ „ Appellöf. Bergens Mus. Aarb., p. 12.
- „ „ Michaelsen. Poly ch. deutsch. Meere., p. 174.
,, ,, idem. Grönland. Annel., p. 130.
„ Ssolowiew. Ann. Mus. St. Pétei’sb., t. iv, p. 192, Tab. x, fig. 4.
,, Ehlers. Schwed. Magell. Anne!., p. 16.
„ „ idem. Polych. Magell. u. Chil., p. 214.
„ „ . Fauvel. Bull. Inst. Oceanogr., cxlii, p. 40.
„ „ Wollebæk. Skrift. Yid.-selsk. Krist., No. 18, p. 79, pi. xix, figs. 1—8.
. „ „ - Ehlers. Deut. Südpol. Exped., p. 566.
„ ’ y /‘- Southern. Proc. Roy. Irish Acad., vol. xxxi, No. 47, p. 129.
„ „ McIntosh. Ann. Nat. Hist., ser. 8, vol. xv, p. 39.
,> „ HesslO. Zool. Bidr. Uppsala, Bd. v, p. 131.
Habitat.—Dredged on a muddy bottom in 9 fathoms, Lochmaddy, and also procured
under a stone amongst sandy mud at extreme low water of a spring-tide. Its occurrence
in Loch Portan in the same locality is noteworthy, as the water there has a considerable
admixture of fresh water. St. Magnus Bay, Shetland, in 80 and 100 fathoms; in
90 fathoms 25 miles west of the Blasquet, S.W. Ireland (J. G. Jeffreys), 30—40 fathoms
in Dingle Bay, Ireland, “ Porcupine,” 1869. At 690 fathoms in the Atlantic, No. 3,
“ Porcupine,” 1870 (small); 358 fathoms in the Atlantic Station No. 6 in the same
expedition; W. Coast Ireland, Clew Bay, etc. (Southern).
It elsewhere occurs off Bergen, Norway (Canon Norman, Wollebsek); Greenland
(“ Valorous,” and Michaelsen); Spitzbergen (Fauvel); Sweden (Malmgren and Hessle) ;
shores of France (De St. Joseph); Canary Islands and Madeira (Langerhans); Magellan
and Antarctic Seas (Ehlers); Mediterranean; Atlantic Coast of America (Webster and
Benedict); White Sea (Ssolowiew).
C&ullery found none in the collections of the Siboga Expedition. It also occurs at
the South Pole.
The cephalic lobe differs from that of Poly cirrus in its reduced condition. Dorsally
it has a groove separating it from the first segment, and is provided with two eye-spots,
the lobe then projecting forward as two symmetrical rounded bosses flanked on each side
by a translucent free flap. From the surface springs a dense series of tentacles, filiform,
and fusiform. The filiform are pale pink m colour, and like the larger clavate, grooved,
red-streaked tentacles, keep up a continuous movement. The translucent lateral flaps are
devoid of tentacles. The distinction between the three groups of appendages is distinct
in some preparations. The branchige are coiled, the posterior small tentacles filiform,
whilst the larger are clavate and grooved. The mouth opens in the centre above a line
joining the attachments of the translucent lateral flaps and in a groove between the two
prominent anterior bosses.
The body (Plate CXV, figs. 5 and 5 a) is terebelliform in appearance, about an inch
in length, enlarged anteriorly and tapered posteriorly to terminate in an anus with two
cirri. It is rounded dorsally, grooved ventrally, and has about seventy segments. The
mouth opens .anteriorly at the furrow between the bosses, the translucent lateral flaps
curving inward to be attached on each side. Ventrally is the tumid and streaked lower
lip which forms the conspicuously truncated anterior end. The grooves generally show
a symmetrical arrangement, a broad median belt passing down the centre, flanked by two
or three stripes on each side, the ventral end being split. The second segment forms a
continuous ring dorsally and ventrally, and sometimes projects forward dorsally so as
to ensheath the posterior cephalic edge and the eyes. It bears dorsally the first
branchia, on each side—a single thick and proportionally long filament tapered distally,
distinguished by the bright red central vessel and often by the spiral condition. The
third and fourth segments also bear a pair of gills, which readily fall off in the preparations.
The general colour is blood-red, darker anteriorly, paler posteriorly. The lip is
rich red, whilst the lateral flaps are translucent. The coelomic corpuscles (and ova r) are
pale red, and appear through the transparent skin as they roll about. A red bloodvessel
runs along the centre of the ventral surface.
The short setigerous processes, which have oblique tips, commence on the sixth
segment, and are fifteen in number. Each tuft has two series, a longer and a shorter (Plate
CXXVII, figs. 4 and 4 a). The larger bristles are pale golden, one half more or less free,