56 
CLASS 1.— ORDER I. 
FILIFORM. 
5. Cell aria jiliformis . Articulations filiform, very 
fine, and quadrangular ; cells alternate. 
Indian Ocean. 
CABEREA. 
Fron descent Polypidom, cylindrical or a little 
compressed ; cells on one surface, the opposite side 
furrowed ; furrow longitudinal, straight, and pinnated. 
The substance of these Polypidoms is more calca- 
reous than membranous. 
Their colour is yellow fawn, more or less brilliant. 
Their size varies from four to six decimetres. 
They are never parasites on marine plants ; it is 
by numerous fibres, and, not by a base, that they fix 
themselves on the rocks and solid Polypidoms of 
Australasia. 
PINNATED. 
1. Caberea pinnata . Stem pinnated and cylin- 
drical, as are also the branches ; pinules or branches 
alternate, cells in united formation, usually two toge- 
ther ; furrows transverse. Colour yellowish : height 
seven or eight centimetres. 
Australasia. 
DICHOTOMOUS. 
2. Caberea dichotoma. Branches dichotomous and 
compressed. Cells small and numerous, convex on 
the back of the Polypidom, where they produce a lon- 
gitudinal furrow, with alternate and diverging furrows. 
