MAEINE ALGiE. 



59 



Order IX. CORALLINACE^. 



Rigid, articulated, or crustaceous, mostly calcareous 

 sea-weeds, purple when recent, fading, on exposure, to 

 white, composed of cells, in which carbonate of lime is 

 deposited in an organized form. Tetraspores tufted, 

 contained in spherical conceptacles. 



XLVI. CORALLINA. 



Frond filiform, articulated, branched, mostly pinnate, 

 coated with a calcareous deposit. 



1. Corallina officinalis. 



2. „ elongata. 



3. „ squamata* 



XLVII. Jania. 



Frond filiform, articulated, dichotomous, branched, 

 coated with a calcareous deposit. 



1. Jania rubens. 



2. „ corniculata. 



XL VIII. Melobesia. 



Frond attached or free, opaque, covered with a calca- 

 reous deposit. Tetraspores scattered over the surface 

 of the frond. 



