TUBICOLiE. 451 



There are some whose branchise merely form a simple funnel 

 round the mouth; their filaments, however, are numerous, crowded, 

 and strongly ciliated on the internal surface(l). Their silky feet are 

 almost imperceptible. 



Finally, others have been described which have but six filaments, 

 arranged in a stellate form(2). 



Terebella, Cuv.(3) 



The Terebellse, like most of the Sabellas, inhabit an artificial tube, 

 but it is composed of grains of sand and fragments of shells; their 

 body, moreover, has fewer rings, and their head is otherwise de- 

 corated. Numerous filiform and * extremely extensible tentacula 

 surround their mouth; their branchiae, placed on the neck, are not 

 infundibuliform, but resemble arbusculs. 



Several species are found on the coast of France, long con- 

 founded under the name of Terehella conchilega, Gm., Pall., 

 Miscel., IX, 14 — 22, most of which are remarkable for tubes 

 formed of large fragments of shells, the edges of their opening 

 being prolonged into several little branches, composed of simi- 

 lar materials, and containing the tentacula. 

 In the greater number there are three pairs of branchiae, which, 

 in those where the tube is branched, issue through a peculiar hole 

 formed for that purpose(4). 



N.B. On account of the imperfection of the figure of Ellis, Coral., pi. xxxiii, I 

 do not know to which of these subdivisions we should refer the Amphitrite venti- 

 labrum, Gm., or Sabella peniciUus, L., Ed. XII. 



(1) Sab. villosa, Cuv., a new species. 



(2) Tubularia Fabricia, Gm., Fabr., Faun. Grcenl., p. 450 — the genus Fabhicia, 

 Blainv. 



(3) Linnaeus, in his twelfth edition, had thus named an animal described by 

 Ksehler, and which might have belonged to this genus because it was thought to 

 perforate stones. Lamarck has employed the same name — An. sans vert., p. 

 324, for a iVems and for a Spio. The Terebellae, Gm., coT[\^ve.h.enA Amplunomae, 

 Nereides, Serpulae, &c. Messrs Savigny, Montag., Lamarck, and Blainville, em- 

 ploy this name as above, which was proposed by me. Diet, des Sc. Nat., II, p. fg. 



(4) They are the sim])le Terebellae of Savigny, such as: Tereb. medusa, Sav., 

 Eg., Annel., I, f. 3; — Ter. cirrliata, Gm., Mull., Ver., XV; — Ter. gigantca, Mon- 

 tag., Lin. Trans., XII, 11;— T. nebulosa, Id. lb., 12, 2;—T. constrictor. Id. lb., 13, 

 1; — T.venusta,Vo., 2; he also calls one of them T. eirrhata, lb., XII, 1; but which 

 does not appear to be the same as that of Muller. Add T. variabilis, Risso, &c. 



N.B. M. Savignymakestvvoother divisions of Terebellae, the T.Piitzelije, which 

 have but two pairs of branchix, and the T. Idali^e, that have but one pair. Among 

 the latter would come the Amphitrite cristata. Mull., Zool. Dan.,lxxi, 1, 4; Amph. 

 ventricosa, Bosc, Ver., I, vi, 4 — 6. 



