G. AMPHIROA. 135 , 



1 

 RIGID. ^ ! 



1. Am PHI RO A rigida. Branching ; branches dis- ! 

 persed and few in number ; articulations cylindrical, I 

 nearly touching each other, and wrinkled ; colour 



greyish white ; height about three centimetres. — 

 Plate 11. fig. 1. 

 Mediterranean. 



SHINING. 



2. Amphiroa lucida. Branches dichotomous ; i 

 articulations perfectly cylindrical and shining; colour : 

 white ; height from four to six centimetres ; diameter 



of the articulation one millemetre. 



I 



SPINDLE-SHAPED. \ 



3. Amphiroa yMsoVaes. Dichotomous; articula- 1 

 tions spindle-shaped, the lower ones warty ; colour, a 

 brilliant white ; height from four to six centimetres ; \ 

 diameter of the stem and lower branches from one to i 

 two millemetres. — Plate 11. fig. 2. 



Indian Ocean. 



BRITTLE. 



4. Amphiroa fragilissima. Nearly dichotomous; 

 branches hair-like ; articulations cylindrical, with a 

 swelling in the form of a ball or pad at their extre- 

 mities. 



Mediterranean, Indian and American seas. 



DE GAILLON'S. 



5. Amphiroa Gaillonii, Dichotomous; articula- 

 tions long and cylindrical, a little swelled at the ex- 

 tremities ; those at the summits slightly compressed ; 

 surface sometimes warty ; beautifully coloured with 



