G. AMPHIROA. 137 



points ; colour, a greenish rose ; height from three to 

 four centimetres. — Plate 11. fig. 4. 

 Australasia. 



INTERRUPTED. 



10. Amphirg A iuterrnpta. Branches verticillated ; 

 articulations of the principal branches separated by 

 long and unequal intervals ; these intervals approxi- 

 mate in the secondary branches, and touch in the 

 small ones ; colour, a reddish green ; height from three 

 to four centimetres. — Plate 11. fig. 5. 



Australasia. 



MANED. 



11. Amphiroa jubata. Branches verticillated; 

 articulations of the principal branches very thick ; 

 those of the verticil very small, unequal, and hair-like ; 

 colour inclining to red ; height from four to six centi- 

 metres. — Plate 11. fig. 6. 



Australasia. 



CHAROIDAL, 



12. Amphiroa charo'ides. Branches verticillated, 

 with verticils of small branches at each articula- 

 tion ; articulations cylindrical, long, and unequal ; 

 the surface warty or with tubercles ; colour, an 

 earthy yellow ; height a decimetre. 



Australasia. 



BRIERY. 



13. Amphiroa tribulus. Articulations cylindrical, 

 compressed, or sharp-edged. 



American seas. 



Cor, S 



