ORDER TUBICOLiE. 
11 
M. de Lamarck distinguishes : 
Spiro rbt s, Lcim., in which the branchial threads are 
much less numerous, three or four on each side ; their tube is 
a tolerably regular spiral, and they are usually very small 
SA BELLA, CuV.j f 
Have the same kind of body, and the same fan-like gills as 
the Serpulae. But the two fleshy filaments adherent to the 
gills both terminate in a point, and form no operculum ; they 
are sometimes even entirely wanting. Their tube most fre- 
quently appears composed of grains of clay, or very fine mud, 
and is rarely calcareous. 
The known species are pretty large, and their branchial 
plumes are delicate and brilliant in the extreme. 
Some of them, like the Serpulse, have a membranous disc on 
the anterior portion of the back, through which pass the first 
pairs of bundles of hairs. Their branchial combs are spirally 
convoluted, and their tentacula are reduced to slight 
folds J. 
III. xvi. 7, and the Actinia or Animal-flower, Horn. Lect. on Comp. 
Anat. II. pi. I. On this spiral convolution of the gills, M. Savigny esta- 
blishes his subdivision of Serpulce Cymospirce, of which M. de Blainville 
has since made a genus. Add. T. Stellata, Gm. Abildg., loc. cit., f. 5. re- 
markable for an operculum formed of three plates strung together. 
* Serpula Spirillum . Pall. nov. act. Petrop. V. pl.V. f. 21. Serp. Spirorbis. 
Mull. Zool. Dan. III. lxxxvi. 1 — 6. 
f This name of Sabella designates in Linnaeus and Gmelin various 
animals with factitious, and not transuded tubes. We confine it to those 
which resemble each other in their proper characters. M. Savigny has 
employed it as we have, with the exception of our first division, which he 
places among his Serpulae. M. de Lamarck calls our Sabelke, Amphitritae. 
X M. Savigny leaves this division among the Serpula?, and makes of it 
his Serpulce Spiramellce, of which M. de Blainville has since made his genus 
Spir amelia. 
