DENDRONOTUS. 235 



Trltonia Repwidsii, Couthout, Bost. Journ. Nat. Hist. ii. 74, pi. 2, figs. 1-4 (1838). — 



Be Kay, N. Y. Moll. 8, pi. .5, tig. 94 (1843). 

 Tiitonia lactea, Thomp. Ann. Nat. Hist. v. 88, pi. 2, fig. 3. 

 Tritonia pitlchella, Aldeii and Hancock, Ann. Nat. Hist. ix. 33. 

 Dtitdronolits arboresceiis, Alukr and Hancock, Nudib. Moll, in Eay See. Fam. 3, pi. 3 



(1850). — Stkmpson, Mar. Inv. Grand Manun, 20 (1853). — Loven, Index Moll. 



Scand. 6 (1846) (lin(j. denlic. pi. 3). — Ciienu, Man. de Conch, i. 407, fig. 3059 (1860). 



— Adams, Gen. ii. 65, ])1. 64, fig. 7. 

 Dendronotus Ixeijiwldsti, Stimpson, Check Lists, 4 (1860). 



Body elongated, tapering, rounded above, as high as broad ; color 

 very variable, reddish marbled with l)ro\v'ii and opaque white, or 

 pale rose color, or white or dark mottled brown ; surface somewhat 

 wartj ; head blunt with a coronet of about six antler-like aj^pend- 

 ages directed forwards. Tentacular sheaths long, terminating in 

 five ragged fringes, with one at the posterior base also. Tentacles 

 club-shaped, pale yellow, with five or six transverse plates. Bran- 

 chiffi in six or more pairs, diminishing in size backwards, delicately 

 transparent, with a few opaque spots, contractile, Ijeautifully and 

 intricately arborescent, the numljer of tufts and branchlets increas- 

 ing with age. Foot thin and delicate, showing the viscera beneath, 

 adapted for clasping. Heart forming a large swelling between the 

 four anterior branchiee, pulsating about seventy-five per minute. 

 Eyes exceeding small, on the lateral base of the tentacular sheath. 

 Length, two and three inches or more. 



Found on Tabularia and elsewhere about the Bath-house, Crai- 

 gie's Bridge, Boston ( Couthoui/, Gould) ; on rocks and Laminaria 

 in the Harbor {Stimpson} ; Lynn (^Hohler). Fine large specimens, 

 commonly colorless, in all parts of the Laminarian Zone; on rocky 

 bottoms. Grand Manan (^Stitnpson^ ; in tide pools, Kennebunk (Reu. 

 J. Swan) ; quite common in the northern parts of the British Isles 

 {Alder and Hancock) ; Scandinavia (^Loven) ; Greenland (O. Fa- 

 bricius). 



This is a most curious and beautiful animal, both on account of 

 its graceful and at the same time fantastic form, and its Inilliancy 

 and variety of coloration, which, with varied number and complica- 

 tion of its appendages, mostly from age, has given rise to a number 

 of names. Extended observation, however, has shown that all are 

 forms of the same animal. Its motions are slow, and its great plia- 

 bility enaljles it to grasp and make its way over minute stems of 

 plants and zoliphytes with great ease. It also floats easily at the 

 surface in an inverted position. Tbo spawn is issued in a small 

 ljobl)iii-like thread looped into flounces and hung upon zoophytes, or, 

 when deposited on a plane surface, laid in a regular spiral. 



