G. CORALLINA. 131 



HAIRY. 



15. CoRALLiNA pilifera. Articulations of the stem 

 and principal branches nearly globular, covered with 

 dispersed and hairy filaments, branching from their ori- 

 gin, articulated, cylindrical, and sometimes half a centi- 

 metre long ; ovaria pyriform, sometimes with filaments 

 like the articulations of the stems ; colour white, with 

 a slight shade of green or violet ; height from four to 

 five centimetres. 



Australasia. 



SIMPLE. 



16. CoRALLiNA simplex. Very slightly branching ; 

 articulations cylindrical at the base, compressing al- 

 most immediately, unequal in size, and of various 

 forms ; straw-colour ; from four to five centimetres in 

 height. — Plate 10. fig. 4. 



American seas. 



CALVADOS. 



17. CoRALLiNA Calvadosii. Articulations irregu- 

 larly compressed, sometimes zoned like the Ulva pa- 

 vonia ; those of the stem and the lower branches more 

 broad than long, nearly triangular, and marked with 

 two or three furrows ; those at the extremities nearly 

 cylindrical ; height three or four centimetres. 



Particularly observed on the rocks of Calvados. 



PALMATED. 



18. CoRALLiNA palmata. Articulations com- 

 pressed, convex and cuneiform; the upper ones 

 large and lobed. 



American seas. 



