80 
SUPPLEMENT 
We have already said, that M. de Lamarck divides the 
serpulae of Linnaeus into four genera : these are serpula pro- 
per, spirorbis, vcrmilio, and Galeolaria. The spirorbes differ 
from serpula only because the entire testa is constantly ap- 
plied to some body : vermilio, which belongs to the gasteropod 
mollusca of the “ regne animal,” and differs not from ver- 
metus, — because the operculiform tentaculum of the animal 
is surmounted by a small testaceous piece ; and galeolaria, 
the second division of serpula, in the text, because this tes- 
taceous piece, operculiform, is not simple, but very complex. 
M. Savigny has not adopted this arrangement, nor indeed 
mentions any species with calcareous operculum : his dispo- 
sition of the species is deserving of all attention in conse- 
quence of the above-mentioned principle which he has fol- 
lowed, of taking the animal into consideration, as well as the 
envelope. 
The genus SPIRORBIS was established by Daudin, for the 
species of Serpulae by Linnaeus and Gmelin, whose testa, ad- 
herent in its entire extent, is rolled flatly, in a manner almost 
regular, and thus forms a sort of planorbic shell. As for the 
rest, the Spirorbes have all the characters of the true Serpulae, 
the animal perhaps differing still less than the shell. Accord- 
ingly, M. Savigny has rejected this genus from his distribu- 
tion of Annelida. 
The manners and habits of the Spirorbes do not differ from 
those of the other Serpulae : they are always very small ; some 
of them are to be found in all seas, fixed upon every species 
of marine body, dead or living. M. de Lamarck characterizes 
five living species, but it is not improbable that there is a 
greater number in existence. 
The name Sabella has been employed by Linnaeus in the 
tenth edition of the Systema Naturae, and afterwards by 
Gmelin, in the thirteenth edition of the same work, to desig- 
nate a genus of his order of testaceous worms which he de- 
