MARINE ALG2B. 



57 



1. Dasya coccinea. 



2. ,, ocellata. 



3. „ arbuscula. 



4. „ venusta. 



Order VIII. LAURENCIACEiE. 



Rose-red or purple sea-weeds, with a cylindrical or 

 compressed branching frond. Fructification double : — 



1. Conceptacles containing a tuft of pear-shaped spores ; 



2. Tetraspores immersed in the branches and ramuli, 

 scattered, without order, through the surface-cells. 



XLIL 15 ON NE MA IS ONI A. 



Frond filiform, extremely branched. The branches 

 margined with distichous, awl-shaped, alternate cilia. 

 Tetraspores unknown. 



1. Bonnemaisonia asparagoides. 

 XLIII. Laurencia. 



Frond cylindrical or compressed, purplish, yellowish, 

 or reddish. Structure cellular, solid. Fructification 

 of two kinds on distinct individuals. 



