Origin of hydroid
Examples from the Web for hydroid
The medusa which this hydroid liberates is called Thaumatias diaphana.
Long ago, Trembley attempted to cause, by grafting, the union of two pieces of hydroid polyps into a single individual.The Biological Problem of To-day|Oscar Hertwig
The Hydroid Zoophytes are represented in the first plate by the following examples.Glaucus|Charles Kingsley
If the stem of this hydroid, which is usually covered with polyps, is put into an aquarium the polyps soon fall off.Darwin and Modern Science|A.C. Seward and Others
There are some species which, having no hydroid or strobila state, mature without alternation of generation (metagenesis).