ANNELIUES. 127 
tubes there with the ooze or other matters, or even exude a calcareous 
substance, which envelopes them with a sort of tubular sliell. 
Division of the Annelides into three Orders. 
This class, which contains but few species, presents a sufficient 
basis of division in its organs of respiration. 
The branchi 2 e of some resemble tufts or arbusculae, attached to the 
head or anterior part of the body : they, nearly all, inhabits tubes. 
We will call them the Tubicol.®. 
Those of others resemble trees, tufts, laminae or tubercles in 
which vessels ramify, and are placed on the middle of the body : 
most of them inhabit mud or swim in the ocean, the smaller portion 
being furnished with tubes. We name them the DoRSiBRANCHiAXi®. 
Others again have no apparent branchiae, and respire, either by 
the surface of the skin, or as some authors opine, by the internal 
cavities. Most of them live free in mud or water ; some of them 
only, in humid earth. They are the Abranchiat.®. 
I'he genera of the first two orders are all furnished with stiff setae, 
of a metallic colour, that issue from their sides, sometimes simply, 
and at others in fasciculi, which serve in lieu of feet; but there are 
some genera in the third order which are deprived of that support*. 
The special attention paid by M. Savigny to these feet or organs 
of locomotion, has resulted in the distinction of the following parts : 
1. The foot itself, or the tubercle which supports the setse; some- 
times there is but one to each ring, and at others there are two, one 
above the other, styled a simple or double oar. 2. The setae, Avhich 
compose a fasiculus for each oar, and which vary greatly in form and 
consistence, sometimes constituting true spines, and at others, fine and 
flexible hairs, frequently dentated, barbed, &c.t 3. The cirri or 
fleshy filaments adhering to the foot, either above or beneath. 
The head of the Annelides of the two first orders is generally fur- 
nished with tentacula or filaments, to which, notwithstanding their 
fleshy nature, some modern naturalists give the name of Antennae ; 
and several genera of the second and third, are marked with black and 
shining points, usually considered as eyes. The organization of their 
mouth varies greatly. 
* M. Savigny has proposed a division of the Annelides, to be founded on the 
presence or absence of these locomotory setae ; those in which they are wanting 
being reduced to Leeches. M. de Blainville, who has adopted this idea, forms his 
class of the Entomozo aria: Chetopodes with the Annelides that have setae, and 
that of the Entomozoaria Apodis with those which have none, but in mixing 
many of the Intestini with the Apodes, he has done what M. S. did not do. 
"b See on this subject, the Mem. of M. Savigny on the invertebrate animals, and 
those of Messrs. Audouin and M. Edwards on the Annelides. 
