136 
CLASS II.— ORDER II. 
rase, violet, and green ; height from six to eight cen- 
timetres.— Plate 11. fig. 3. 
Australasia. 
DILATED. 
6. Amphiroa dilatata. Dichotomous, and very 
stiff ; branches almost divergent ; articulations very 
distant, frequently with a small round swelling at 
the extremities, cylindrical in the lower part, com- 
pressed in the middle, and becoming nearly flat at the 
summits ; generally of unequal breadth ; colour va- 
riegated with green, red, and violet ; height from five 
to seven centimetres. 
Australasia. 
DE BEAUVOIS’S. 
7. Amphiroa Beauvoisii. Dichotomous; stem 
cylindrical ; branches compressed ; extremities nearly 
flat; much smaller than the preceding in all its 
parts. 
Coast of Portugal. 
CUSPIDATED. 
8. Amphiroa cuspidata. Generally tetrachoto- 
mous, but sometimes having only two or three divi- 
sions ; articulations long, cylindrical, and pointed at 
the extremities. 
American seas. 
WARTY. 
9. Amphiroa verrucosa. Trichotomous or subver- 
ticillated; articulations swelled at each extremity, 
cylindrical, and almost wholly covered with warty 
