56 . CLASS 1.— ORDER T. 



FILIFORM. 



5. CEhh\Ri A Jiliformis. Articulations filiform, very 

 fine, and quadrangular ; cells alternate. 

 Indian Ocean. 



CABEREA. 



Frondescent 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 pin?2ata. Stem pinnated and cylin- 

 drical, as are also the branches ; pinnies 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. 



