130 
ANNELIDES. 
Others have no membranous disk anteriorly; tlieir tAvo pectiniform 
branchiae are equal and spii’al* * * § ** . 
There are sometimes two ranges of filaments on each comb f. 
In others again, only one of the two combs is thus fdrmed ; the 
other, which is smaller, enveloping the base of the first , — Sabella 
unixpira, Cuv. ; Spirographis Spallanzanii, Viviani, Phosph. Mar., pi. 
There are some Avhose branchiae merely form a simple funnel 
round the mouth ; their filaments, howcAmr, are numerous, crowded, 
and strongly ciliated on the internal surface §. Their silky feet are 
almost imperceptible. 
Finally, others have been described Avhich haA^e but six filaments, 
arranged in a stellate form 1|. 
Terebella, Ciiv . 
The Terebellae, like most of the Sabellae, inhabit an artificial tube, 
but it is composed of grains of sand, and fragments of shells ; their 
body, moreover, has fcAA^er rings, and their head is otherAvise deco- 
rated. Numerous filiform and extremely extensible tentacula sur- 
round their mouth; their branchiae, placed on the neck, are not infun- 
dibuliform, but resemble arbusculee. 
Several species are found on the coast of France, long con- 
founded under the name of Terebella conchileeja, Gm., Pall., 
Miscel., IX, 14 — 22, most of AA'hich 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, AAdiich, 
in those Avhere the tube is branched, issue through a peculiar hole 
formed for that purpose 
* The simple Sabella of Savigny, AmphUrite reniformis, Miill., Ver., XVI, 
or Tubularia penicillus, Id., Zool., Ixxxix, 1, 2, or Terebella r enif ormis, Gm. •, — 
Ampb. infunilibitlum, Montag., Lin. Trans., IX, viii ; — Amph. vesiculosa, Id. Ib., 
XI, V. 
f The SabellyE Astart.e, Savig., such as the Sabella grandis, Cuv., or Indica, 
gav. ; — Tubularia magnifica, Shaw, Lin. Trans., V, ix. 
+ The SABELL.E Spirographica;, Savigny. 
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 AmphUrite ventilahrum, 
Gm. or Sabella penicillus, L., Ed. XII. 
§ Sab. villosa, Cuv., a new species. 
11 Tubularia Fabricia, Gm., Fabr., Faun. Groenl., p. 450 — the genus Fabricia, 
BlJunv. 
^ Linnseus, in his twelfth edition, had thus named an animal described by 
Koehler, 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 Nereis and for a Spio. The Terebella, Gm., comprehend Amphinoma, Nereides, 
Serpula, &c. Messrs. Savigny, Montag., Lamarck, and Blainville, employ this 
name as abov'e, which was proposed by me. Diet, des Sc. Nat., II, p. 79. 
** They are the simple Terebellas of Savigny ; such as, Tereb. medusa, Sav., Eg., 
Anuel., I,f. 3 ; — Ter, cirrhata, Gm., Mull., Ver., XV ; — Ter. gigantea, Montag., 
