506 CLASS ECHINODERMATA. 
HALYMEDE, Lamourouz, 
Have stems articulated and divided like the corallines; but 
the substance of their articulations, which are very broad, is 
penetrated in the interior by corneous filaments, which are 
easily deprived of their calcareous crust, by acids. (Corallina 
tuna, Sol. et Ell.) 
FLABELLARIA, Lamarck, 
Have no distinct articulations, but form large foliaceous ex- 
pansions, composed like the articulations of the halymedes, 
and the stem of the penicille, of corneous filaments, encrusted 
with a calcareous envelope. (Corallina conglutinata, Sol. 
et Ell., &c.) 
GALAXAURA, Lamourouz, 
Have stems divided by dichotomy, but their branches are 
hollow. (Corall. obtusata, Sol. et Ell., &c.) 
LriaGora, Id., 
Have hollow stems, divided by dichotomy, but without articu- 
lations. (Corall. marginata, Sol. et Ell., &c.) 
It is, perhaps, at the end of the corallines that we should 
place 
ANADIOMENE, Lamourouz, 
Vulgarly known under the name of Corsican moss, and so 
usefully employed as a vermifuge. It is composed of articu- 
lations regularly disposed in branches, of a substance a little 
corneous, covered with a gelatinous coat. (Anadiomene fla- 
bellata, Lamour.) 
Among those productions without apparent polypi, which 
by conjecture are referred to the polyparia, there are few more 
singular than 
