124 
CLASS II.— ORDER II. 
Var. A. European seas ; E. ThalassiophyteS of the 
coast of Cherbourg ; C. Bay of Cadiz. 
CORALLINA. 
Plant-formed Polypidom, articulated, branched* 
and trichotomous ; axe or interior wholly composed 
of horny fibres ; rind cretaceous and cellular ; cells 
invisible to the naked eye. 
The ancient authors had united under the name of 
Coraliinas all the flexible Polypidoms, such as the 
Sertularias, Tubularias, &c. Later writers on the sub- 
ject deemed it advisable to reserve this denomination 
for one order in this class of creation : but observing 
the various characters which accompanied this order, 
I have been induced to divide it into genera, and 
assign particularly to one genus the appellation of 
Corallina. 
The Coraliinas of Europe have their polypean cells 
so very small, and so subject to obliteration, that it is 
not extraordinary they still remain undiscovered : 
in the equatorial seas the cells are much larger, and 
frequently visible to the naked eye. 
In rambling over the Calvados, (a range of rocks 
on the coast of Normandy,) I have frequently found 
a very large Corallina, a variety of the C. Officinalis ; 
it was covered with simple transparent filaments, a 
