138 DR. CUTHBERT COLLINGWOOD ON SOME NEW SPECIES OP 



spersed here and there with minute white spots. Tufts on papillae [light brown. On 

 either side of the body is a row of opaque white projecting tubercles ; and between them 

 and tbe papillary prolongations are some minute turquoise spots, three or four in number. 

 The body generally is opalescent, with faint brown markings. 



Spawn, a loose straw-coloured coil, entwining the leaves and berries of Sargassum 

 bacciferum, and imbedded in a mass of transparent jelly. 



Portion of a branch of Sargasswm bearing a floating bladder, and with ($p) a coil of spawn of Scyllcea fdagica attached. 



Nat. size. 



Considerable numbers of this pelagic species were found upon the Sargassum floating 

 in lat. 25 c X., long. 37° W., most pieces of the weed having one or more specimens. The 

 animals were in a constant movement of contraction and writhing. In the water they 

 swam freely, moving the head and tail from side to side alternately, so as nearly to touch 

 one another ; and when thus swimming were always, owing to the weight of the papillary 

 prolongations and tentacles, back downward, and bore a grotesque resemblance to a 

 four-legged animal with long ears (such as a Skye terrier). They would also attach 

 themselves to the surface of the vessel by a sort of sucker formed by a small cylindrical 

 portion of the foot (fig. 33, PI. X.). There is no figure of this species in Alder and 

 Hancock's work, nor do I know of any good figure. The present ones are from life, and 

 fig. 30, PL X. represents its peculiar falling aspect, as mentioned above. 



Alder and Hancock (T. Z. S. v. p. 136) have described a Scyllcea marmorata and S. viridis 

 as new species, the former of which, save in size, differs little, if at all, from the Linnean 

 species S. pelagica ; but they admit that it is difficult to decide as to what constitute 

 specific differences in the genus. In Dr. Bergh's Monograph of Scyllcea* there is an 

 excellent resume of the subject, and a number of varieties of S. pelagica described and 

 referred to, as well as a good account of the anatomy of the genus given. 



Family DENDRONOTLD^, Alder & Hancock (1855). 



Genus Borxella, Gray (1817). 



Bornella marmorata, Coll., n. sp. (Plate X. figs. 31-38 ) 



Body long and slender, with seven pairs of papillae. Head small, with a veil of five 



* Semper's Reisen, 7. c, Band ii. Heft 8, p. 315 el sc</. 



