ORDER POLYPI POLYPIFERI. 505 
They are divided as follows : 
CoRALLINA proper, 
Have their articulations calcareous, of an homogeneous ap- 
pearance, without any perceptible bark. 
The bottom of the sea is entirely covered on certain shores, 
with the Corallina officinalis, L. Ell. Corall. xxiv. a. A.b. B., 
the articulations of which are in a reversed oval, the small 
branches disposed like pinnated leaves, and themselves sup- 
porting other branches similarly disposed. Itis white, reddish, 
or greenish. It was formerly employed in pharmacy, because 
of its calcareous substance. 
Lamouroux again distinguishes from them, but rather 
slightly, 
AMPHITROE. 
The articulations of which are elongated. (Corallina rigens, 
Sol. et Ell., &c.) 
JANIA, 
Which merely have the branches more slight, and the articu- 
lations less cretaceous. (Corallina rubens, Ellis, &c.) 
CYMOPOLIA, 
In which the articulations are separated one from the other, 
by corneous intervals. Their surface exhibits more marked 
pores. 
M. de Lamarck had already separated, 
PENICILLUS, Lam. Nesea Lamouroux, 
Which have a simple stem, composed internally of corneous 
fibres, woven together, and as it were, felted ; encrusted with 
a calcareous plaster, and terminated by a bundle of articulated 
branches, analogous to those of the ordinary corallines. (Co- 
rall. penicillus, &c.) 
