This gigantic creature grows from the small one, called a hydroid, represented in the small cut.    From Wordnik.com.  [Harper's Young People, November 18, 1879 An Illustrated Weekly] Reference

You see the hydroid does not in the least resemble a jelly-fish.    From Wordnik.com.  [Harper's Young People, November 18, 1879 An Illustrated Weekly] Reference

The Yekta of the Crimson Sea, are as extraordinary developments of hydroid forms as the giant.    From Wordnik.com.  [The Moon Pool] Reference

They were velella vellella - a hydroid similar to a jellyfish, with the common name of "By-the-wind-sailor".    From Wordnik.com.  [December 2008] Reference

Silurian age a very rich fauna has already developed, and representatives are found of all the main Invertebrate groups -- sponges, corals, hydroid colonies, five types of Echinoderms, Bryozoa.    From Wordnik.com.  [Form and Function A Contribution to the History of Animal Morphology] Reference

The smaller the piece, within certain limits, and the younger physiologically, the more nearly does it return to embryonic conditions, a fact which can be studied admirably in the hydroid Corymorpha.    From Wordnik.com.  [Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86] Reference

It was a hydroid, a development of that strange animal-vegetable that, sometimes almost microscopic, waves in the sea depths like a cluster of flowers paralyzing its prey with the mysterious force that dwells in its blossom heads!.    From Wordnik.com.  [The Moon Pool] Reference

Trematode ‘nurse’ can develop within itself the very unlike ‘Cercaria’, it will not appear impossible that the egg, or ciliated embryo, of a sponge, for once, under special conditions, might become a hydroid polype, or the embryo of a.    From Wordnik.com.  [Essays] Reference

These animals take two generations to complete one life cycle, one of which consists of polyps living in hydroid colonies.    From Wordnik.com. Reference

Mr. Clark, one of my assistants, has made very good drawings of all its stages of growth, and of various other hydroid medusae peculiar to this coast.    From Wordnik.com.  [Louis Agassiz: His Life and Correspondence] Reference

It may, as Dr. Haast supposes, be a ground feeder, existing on the smaller hydroid zoophytes, otherwise it must, I think, turn on its side in seizing its prey.    From Wordnik.com.  [Natural History of the Mammalia of India and Ceylon] Reference

Obelia hydroid: First Generation - The first obelia generation, illustrated in the photomicrograph in this section, lives in hydroid colonies, consisting of polyps.    From Wordnik.com. Reference

In other words, a hydroid is exactly like its grandmother and granddaughter, but as different from its parents and children in appearance as a plant is from an animal.    From Wordnik.com.  [The Log of the Sun A Chronicle of Nature's Year] Reference

The same obtains of the Hydra and the related hydroid polyps, in which the neuro-muscular cells, or other distributed cells of the outer germ-layer, fulfil the soul-functions.    From Wordnik.com.  [Freie wissenschaft und freie lehr. English] Reference

It was a hydroid, a development of that strange animal-vegetable that, sometimes almost microscopic, waves in the sea depths like a cluster of flowers paralyzing its prey with the mysteri-ous force that dwells in its blossom heads!.    From Wordnik.com.  [The Moon Pool] Reference

Chironomus pupa, the fertile hydroid polype, and the fertile adult queen bee are simply animals in different degrees of organization, and with reproductive systems differing not in quality, but in the greater or less rapidity of their development as compared with the rest of the body.    From Wordnik.com.  [Our Common Insects A Popular Account of the Insects of Our Fields, Forests, Gardens and Houses] Reference

At a lower level in animal life, that of the hydroid polyps, communism has become so complete that the community has grown into an actual individual, the members not being free, but acting as organs of an aggregate mass, in which each performs some special duty for the good of the community.    From Wordnik.com.  [Man And His Ancestor A Study In Evolution] Reference

Abstract: Data from experiments, in which colonies of a hydroid, Laomedea flexuosa, were exposed to a range of Cu2+ concentrations and a marine yeast, Rhodotorula rubra, was exposed to a range of Cd2+ concentrations, not only exhibit hormesis, but also suggest how its occurrence in growth experiments might be explained.    From Wordnik.com.  [Citizendium, the Citizens' Compendium - Recent changes [en]] Reference

Linnaeus necessitated the breaking up of that class into several very distinct classes, so more careful investigation requires the breaking up of Cuvier's "Radiata" (which succeeded the "Vermes" as a sort of zoological lumber-room) into several very distinct and well-defined new classes, of which the Acalephae, Hydrostatic Acalephae, actinoid and hydroid polypes, will form one.    From Wordnik.com.  [Life and Letters of Thomas Henry Huxley — Volume 1] Reference

It is not to be supposed that one could occupy one's self with the animals for so long without coming to some conclusion as to their systematic place, however subsidiary to observation such considerations must always be regarded, and it seems to me (although on such matters I can of course only speak with the greatest hesitation) that just as the more minute and careful observations made upon the old "Vermes" of Linnaeus necessitated the breaking up of that class into several very distinct classes, so more careful investigation requires the breaking up of Cuvier's "Radiata" (which succeeded the "Vermes" as a sort of zoological lumber-room) into several very distinct and well-defined new classes, of which the Acalephae, Hydrostatic Acalephae, actinoid and hydroid polypes, will form one.    From Wordnik.com.  [The Life and Letters of Thomas Henry Huxley]

I know of no form in which so many of the characteristic features of a typical hydroid are more finely expressed than in this beautiful species. ".    From Wordnik.com.  [The Beauties of Nature and the Wonders of the World We Live In] Reference

Infusoria than of the many-celled hydroid polyps.    From Wordnik.com.  [Freie wissenschaft und freie lehr. English] Reference

(1999) Expression of a Hox gene, Cnox-2, and the division of labor in a colonial hydroid.    From Wordnik.com.  [PLoS ONE Alerts: New Articles] Reference