Some of these last are penetrated by zoaria of Fredericella indica.
The colonies originally start from larv produced in the ovicells of the zoaria.
The zoaria are circular or nearly so except when about to undergo division, in which case they are constricted in the middle.
In the ponds at Port Canning the zoaria grow side by side with, and even entangled with those of Bowerbankia caudata subsp.
Although the zoaria do not form compound colonies by secreting a common membrane or investment, they are markedly gregarious.