12 
CLASS ANNELIDA. 
The Mediterranean possesses a fine and large species, 
with a calcareous tube, like that of the Serpulae, with orange 
gills, &c. Sabella protula , Nob., or Protula Rudolphii 
Risso 
In others, there is no membranous disc in front; their 
branchial combs form two equal spirals •f . 
There are sometimes two ranges of filaments on each comb %. 
In others again, one of the two combs only is thus formed ; 
the other, which is smaller, envelopes the base of the first, 
Sabella unispira , Cuv. ; Spirographis Spallanzanii. Viviani. 
Phosph. Mar. pi. IV. and V. § 
There are some whose gills only form round the mouth a 
simple funnel, but with numerous filaments, crowded, and 
strongly ciliated on the internal surface. Their hairy feet 
are almost imperceptible ; Sabella villosa , Cuv. New species. 
Some, in fine, have been described, which have but six 
filaments, arranged like a star. Tubularia Fabricia , Gm. 
Fabr. Grceul. p. 450 ; it is the genus Fabricia, of Blainville. 
Terebella, Cuv., 
Inhabit, like most of the Sabellse, a factitious tube ; but it is 
composed of grains of sand and fragments of shells. More- 
* The existence of this magnificent species, and the calcareous nature of 
its tube, are incontestible, notwithstanding the doubt expressed. Diet, 
des Sc. nat. lvii. p. 432, note. The Sabella bispiralis ( Amphritrite volu- 
tacornis , Trans. Linn. VII. vii.) differs very little from it. I dare not 
affirm that it is the same as Seb. I. xxix. 1. erroneously cited by Gmelin 
and Pallas, under Serpula gigantea , for this figure exhibits no disc. 
f These are the simple Sabella? of Savigny. Amphitrite reniformis , 
Mull. Ven. xiv. or Tubularia penicillus , id. Zool. lxxxix. 1. 2. or Terebella 
reniformis, Gm. ; Amphitrite infundibulum, Montag., Lin. Trans., IX. viii. ; 
Amph. vesiculosa, id. ib. XI. v. 
X These are the Sabellce Astartce, Sav., such as Sabella grandis , Cuv., or 
Indica, Sav.; Tubularia magnifica, Shaw, Linn., -Trans. V. ix. 
§ These are the Sabellce Spirographicce of Savigny. 
