Travers picked up a seed of Edwardsia in the Chatham Islands, evidently washed ashore from New Zealand (Linn.
Formerly the island appears to have been wooded, but it now presents only a few bushes (Edwardsia, Broussonetia, &c.), ferns, grasses, sedges, &c. The natives grow bananas in the shelter of artificial pits, also sugar-canes and sweet potatoes, and keep a few goats and a large stock of domestic fowls, and a Tahitian commercial house breeds cattle and sheep on the island.
In this sub-class the arrangement of the mesenteries is subject to a great deal of variation, but all the types hitherto observed may be referred to a common plan, illustrated by the living genus Edwardsia (fig.
It is not known whether all the eight mesenteries of Edwardsia are developed simultaneously or not, but in the youngest FIG.
A, Edwardsia claparedii (after A.
In Actinia equina the Edwardsia stage is arrived at somewhat differently.
The derivation of the Zoanthidea from an Edwardsia form is sufficiently obvious.
In the Cerianthidea, as in the Zoanthidea, much as the adult arrangement of mesenteries differs from that of Actinia, the derivation from an Edwardsia stock is obvious.
As the development of the Antipathidea is unknown, it is impossible to say what is the sequence of the mesenterial development, but in Leiopathes glaberrima, a genus with twelve mesenteries, there are distinct indications of an Edwardsia stage.