392 



ANNELIDES. 



like the antlers of i\ sta^. Tliis is tlie Tcref'dla hicornes, Alx.'Idf^., and tlie Acihiia or A}iim(il'Jlov:er of Home. 

 M. Savi;jny lias made of it his subdivision of Scrpuh-n c//mo6'p/rri-, whkh M. BlainvilJe elevates to the rank of 

 a j:;enus. 



M. Lamarck distinixuishes the .S/^frori/ir, the branchial filaments of which are much less numerous (three or 

 four only on each side) ; their tube is of a tolerably rej;;ular spiral form, and they are mostly very small ; such is 

 .V. ^pirell'im, Pallas, and S. spirurbis, Mullen 



Sauella, Cuv. {.ImphHrite, Lam.) 

 The same body and fan-like gills as in Seiyvla, but vvitli the fle^diy filamcnls adhering to the bran- 

 chire, pointed, and neither of them forming an ojicrculiun ; they arc also not always present. Their 

 tube appears oftener composed of granules of clay or very fine mud, and is rarely calcareous. The 

 known species are rather large, and their brancliial tufts are of an admirable delicacy and beauty. 



Some, like the SerpuLc, have on the anterior portion of the back a membranous disk, across which pass the first 

 pairs of their bundles of Ijristles ; their branchial pectinations are turned spirally, and their tentacles reduced to slig-ht 

 folds. They are the Serpules sp'tramelles of JM. Savig;iiy, and the SplramUla, Blainville. A lari^e and beautiful 

 species inhabits the Mediterranean, with a calcareous tube like that of the ISerpuhe, or orang;e-coloared gills, &c., 

 the S. protulay Nobis, or PasluUi Rudolplui, Ilisso. 



Others have no membranous disk on the foreparts, and their branchial pectinations form two equal spires, the 

 Sabellcs simples of M. Savi^ny. Such are Amphritlte rcniformts, MuUer, or Tubularia peincillns, Id. ; also I'ere- 

 bella reniformis, Gmelin, together with the Amphritite iufandibulum, Montagu, and A. vesiculosa, Id. 



There are some witli a double range of filaments on each pectination— the SabelUc AstartcC, sav., such as S. 

 ffrandis, Cuv., or S. indeca, Sav., and the Tubularia magnifica, Shaw. 



Others in which one pectination only is twirled, the others being smaller, and enveloped within the base of the 

 first. The Habelles spirographcs, Sav., as S. unispira, Cuv., and Spirographi.s Spallanzani, Mart. 



In some the gills do nut form a simple funnel round the mouth, but numerous filaments, which are serrated and 

 strongly ciliated on the internal face; the silky feet of these are almost imperceptible— such is -S. i-;7/'.;.!,«, Cuv. 



Lastly, some have been described with six filaments disposed tike a star— the Fabricla of Blainville. 



Terebella, Cuv., — 



Like the greater number of species of Sahella, inhabit a factitious tul)e, but which is composeil of 



grains of sand, and fraguicuts of shells ; their body has 



^^:v^ ,a^^^ much fewer rings, and the head is ditferently ornamented. 



Numerous filiform tentacles, capable of much extension, 

 surround tlie mouth, and upon the neck are gills of an ar- 

 buscular, and nut a fan-like form. 



There are several on our coasts which were long confounded 

 under the name of Terebella concfiilega. Gut., and which are 

 mosty i-cmarkable for having their tubes formed of large frag- 



i?^^ 



Fiij. '2110.— TcrcbclU im.-riusn., in its tube. 



ments of shells, tlie aperture having its bordtrs prolonged into several 

 small branches formed uf the same fragments, which serves to lodge 

 the tentacles. 



The greater number have throe ]iairs of branchiae, ^^hich in those with 

 branched tubes pass through a hole for the pu)|.)ose ; they are the 

 Terebelles simples, Sav. 



Amphitrite, Cuv. — 

 Are easilv recognized by their golden-C(donre(l sjiincs, disposed \ (T^l 

 in a comb-like series, or in a crown, in one or several ranges 

 upon the forepart of the licad, and wliicb proltably serve them 

 for defence, or perhaps to crawl with, tu" tit gather up tin; mate- 

 rials for tlie tube. Around the mouili are very numerous ten- 

 tacles, and on either side of the commi'ucement of tlie back are 



. , , ,, Tiu'. 1:01.— TerL-bcUn variabilis. 



pectinated gnls. 



Some of them compose sHght tubes, of a regular conical form, which they carry about with tlv-ni. Their gilded 

 spines form two comb-like series, the tei/tli nf which are directed downwards ; and the intL-stiue is very ample, 

 and several times folded, being ordinarily full of sand ; they are Pecthmires of Lamarck, the Amphyctines, Sav., 

 the Chnjsodnns, Oken, and the Chfena, Leach. Such, upon our coasts, is the A. bclgica, Gmelin, with a tube 

 two inches long, formed of small round granules of various colours. A much larger species occurs in the Southern 

 seas, A. auncoma capensis, Pallas, the slender and polished tube of which appears as though transversely fibrous, 

 and formed of a soft fucus-stem-like substance, dried up. 



There are some species which inhabit factitious tubes fixed to\arions substances. Their gililed spinrs form 

 several concentric crowns upon the head, whence results an operculum that closes the tube \\hru tliey ion tract 

 into it, but which has two parts that can be spread asunder. They have a cirrluis mi each fnut. Their body 



