340 REPORT — 1864. 



16. S. Pauluccice, Fisclier. 



Hah. Eed Sea, among the spines of Echinus trigoiiarius, Lam. : Marquise 

 Paulucci. 



Besides the ahove, may be noticed an undescribed or unnamed species 

 dredged by Mi-. M' Andrew off the Canary Isles (if it is not S. Turtoni), 

 another collected at Guadeloupe by M. Beau, and five more, bearing the 

 foUowing names, but without description, — viz. Stilifer Broderipn, S. Cu~ 

 mingii, S. fastigiatus, and^. soJidus of Adams's 'Genera,' andiS. pyramidcdis 

 of Mr. Eeeve. In the British Museum is an imnamed Stilifer from Port 

 Natal, said to have been found attached to the mouth of a Starfish. 



It is not improbable that some of the species enumerated in the 2nd sec- 

 tion, having an elongated spire, may belong to Eulima or Niso, instead of to 

 Stilifer. 



I am not aware of any fossil species having been discovered. 



I will now give the result of my examination of the animal of S. Turtoni, 

 from notes made at the time. 



Body white, and delicately stippled; the whole of the upper surface is 

 covered with microscopical and extremely short cUia, which are in con- 

 stant motion ; these cilia are arranged in scale-like bunches, and by 

 their action produce a circulating current. 



Mantle thickened at its edges, and spread over the lower part of the shell, 

 so as to form a disk. 



Pallial fold, or branchial opening, on the right-hand side, forming a canal 

 which terminates in an oval or roundish hole. 



Head-lobes, rounded and flattened, nearly transparent, one on each side a 

 little below the snout or mouth. 



Snout rather long when extended, but usually folded inwards and trunli- 

 like, slightly bUobed, and placed between the tentacles and the foot. 



Tentacles club-shaped, somewhat compressed, thick, and rather long, some- 

 times expanded at the tips, which are blunt and widely diverging, 

 but united at their bases ; they are more or less strangulated or con- 

 stricted, usually at about one-fourth of the distance from thcii- bases. 



Eyes exceedingly smaU, seated on the neck or back of the head, at some 

 distance behind the tentacles. 



Foot tongue-shaped and elongated, bulbous and forming a creeping-disk in 

 front, somewhat tubular in the middle, and tapering to a fine point 

 behind ; the sole, or under part, is slit in the middle for more than 

 three-fourths of its length, the opening or commencement of the sUt 

 being near the bulbous part and oval. 



Male organ spike-shaped, and resembling an auxiliary tentacle. 



Habitat. "^Tialsey Skerries, East Shetland, about 40 mUes from land, in 

 80 fathoms, sandy bottom, on an Echinus Drohachiensis. A pair of the Stilifer 

 were attached to the sea-egg on its upper surface, between the spines near 

 the vent or anal orifice ; and the same part was also covered with about forty 

 clusters of spawn, which appeared to be in various stages of development. 

 The adult Stilifers were not firmly attached to the Echinus (Hke the Caligus 

 to a codfish), but frequently shifted their places by creeping between the 

 spines. I gently removed one of them with a stiff camel's-hair brush, and 

 placed it in a glass tube with sea-water. It was at first very sluggish or 

 timid, and evidently unaccustomed to its new habitat, lying at the bottom of 

 the tube; but afterwards it recovered itself, and crawled up the side by 



I 



