54 
CLASS I.— ORDER I. 
ELZARINA. 
Frondescent Polypidoms ; dichotomous, cylin- 
drical, and not articulated. Cells large and dispersed, 
scarcely projecting ; openings oval. 
The only species comprised in this genus resem- 
bles a small cylindrical fucus, branching or dichoto- 
mous. 
The substance is nearly membranous. Colour brown, 
more or less dark. 
They never exceed four centimetres in height ; the 
diameter of the branches varies from one to two mil- 
limetres ; the higher ones are sometimes in the form of 
clubs. 
Elzarina Blainvillii. Cells membranous, large 
and dispersed.— Plate 2. fig. 3. a. B. 
On the Tbalassiophytes of Australasia and of the 
isle of Timor. 
CELL ARIA. 
Plant-like Polypidom, cartilaginous, stony, cy- 
lindrical, and branching. Cells dispersed on the whole 
surface. 
The Cellarias are always articulated, cylindrical, 
dichotomous or branhcing; covered with dispersed 
cells, having a large polygonal opening. Their sub- 
stance is almost wholly calcareous, which renders 
them very fragile and very little flexible. 
When first taken from the sea, their colour is some- 
