THE POLYPIERS. 93 
The Gerardia dredged up by M. Lacaze-Duthiers from the 
Algerine coast, is a kindred and very peculiar species, upon which 
he has written a fine memoir, and has kindly supplied us with the 
a 
A POLYPE OF THE GERARDIA. 
original designs. The living Gerardia is covered with yellow or 
orange-coloured flowers having twenty-four petals, frequently long 
and pendant. 
SECTION OF A POLYPE OF THE GERARDIA. 
The interior of the polype presents just as many divisions as it 
has tentacles. When old, the polypier is very arborescent and thin. 
In the early days of its existence the cortex or bark was deve- 
lcped more rapidly than the substance of the stem. The Gerardia 
