You see the hydroid does not in the least resemble a jelly-fish.
Dendroclava, a hydroid, produces the medusa known as Turritopsis.
The Hydroid Zoophytes are represented in the first plate by the following examples.
This gigantic creature grows from the small one, called a hydroid, represented in the small cut.
Still there were those who would not have grieved had the firm lost its standing in the Hydroid Fibre case.
The illustration shows a plant on which the hydroid Sertularia pumila is growing.
A hydroid about one inch high, growing in patches and appearing like tufts of moss on rocks between tide-marks.
There are some species which, having no hydroid or strobila state, mature without alternation of generation (metagenesis).
This hydroid is found creeping over seaweeds in tide-pools from Long Island Sound northward.
The hydroid Hydractinia polyclina often covers the exterior of such shells with a brown, velvety growth.