DETSTDRONOTUS ARBORESCENS
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DENDRONOTUS ARBORESCENS, Mdllee.
D. rufescens, brunneo marmoratus : velo fasciculis ramosis 4 ornato : branchiis arborescentibus 6-7
utrinque dorsi dispositis.
. Doris arborescens, Mull. Zool. Dan. Prod. 229. Fab. Faun. Groenl. 346. Gmel. v. 1, p. 3107,
No, 25,
Doris cervina ? Gmel. v. 1, p. 3105. No. 12.
Tritonia arborescens, Cnv. in Ann. du Mus. v. 6, p. 434, pi. 61, f. 8, 9, 10. Lam. An. s. Vert;
2d Ed. y. 7, p. 454. Flem. Brit. Anim. p. 284; Johns, in Ann. Nat. Hist. v. 1, p. 115; Gould. Inv.
Massach, p. 5. .
Tritonia Reynoldsii, Couthouy in Bost. Joum. Nat. Hist. v. 2, p. 74. PI. 2, f. 1-4.
Var. a. Hyaline white. (Fide Gould.)
Tritonia lactea, Thomp. in Ann. Nat. Hist. v. 5, p: 88, pi. 2, f. 3.
Var. b. Pink, with opake yellow tubercles.
Tritonia pulchella, Aid. and Hanc. in Ann. Nat. Hist. v. 9. p. 33.
Hab. In crevices of rocks, under stones, and upon sea-weeds and corallines, between tide marks,
and in shallow water; not uncommon in the north. Loch Broom, Ross-shire, and Zetland Islands, Rev.
Dr. Fleming. Aberdeen, Professor Macgillivray. Oban Bay, Argyllshire, J. A. Frith of Forth, Dr.
Grant. Isle of Man, Professor E. Forbes. Lough Strangford, W. Thompson, Esq. Dublin Bay, and
Malahide, Ireland. Whitly and Cullercoats, Northumberland. Torbay.
Body nearly two inches long, linear oblong, rather higher than broad, rounded above,
and compressed at the sides; variable in colour, but generally of a reddish hue, streaked
and marbled with brown, and with small opake white or yellow tubercular spots. The
most usual variety has reddish brown markings on a yellowish ground. It is, however, not
unfrequently of a cold sepia colour. The markings are somewhat symmetrically placed on
the sides of the head and shoulders, and along each side of the back between the branchial
processes, and there are also two narrow interrupted streaks down the centre of the back.
Tentacular sheaths nearly as long as the branchial tufts, and set rather apart from each
other. They are divided for about half their length into four, or sometimes five, branches :
these branches are generally subdivided, and there is also a small branch on the outside of
the sheath about half way down. Tentacles clavate, strongly and broadly laminated on the
upper part, with five or six large plates; and intermediate smaller ones, of a pale yellowish
brown. They are aptly compared by Fabricius to a panicle of hops. Veil very short, with
four principal branched^appendages and smaller ones between them. Beneath, on the upper
surface of the lips, therfe are a few small simple appendages of a similar character, and on
each side of them a slight tentacular prolongation. Branchiae beautifully arborescent; the
stem nearly cylindrical, and rising gradually from the back. They are delicately transparent,
of the same, colour as the body, with dark and opake yellow or white spots, the latter
slightly tubercular. In most individuals the colour of the central vessel is seen through.