Fam. 3, Plate 3. 



DENDRONOTUS ARBORESCENS, Muller. 



D. rufescens, brunneo niarmoratus : velo fasciculis ramosis 4 omato : branchiis arborescentibus 6-7 

 utrinque dorsi dispositis. 



Doris arborescens, Mull. Zool. Dan. Prod. 229. Fab. Faun. Groenl. 346. Gmel. v 1 n 3107 

 No. 25. it-.* 



Doris cervina ? Gmel. v. 1, p. 3105. No. 12. 



Tritonia arborescens, Cuv. in Ann. du Mus. v. 6, p. 434, pi. 61, f. 8, 9, 10. Lam. An. s. Vert. 

 2d Ed. v. 7, p. 454. Mem. Brit. Anim. p. 284; Johns, in Ann. Nat. Hist. v. 1, p. 115; Gould. Inv. 

 Massach, p. 5. 



Tritonia Reynoldsii, Couthouy in Bost. Journ. Nat. Hist. v. 2, p. 74. PL 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. 



Hah. 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, Argyleshire, 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, there are a few small simple appendages of a similar character, and on 

 each side of them a slight tentacular prolongation. Bronchia 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. 



