The Corals and Sea Anemone ClipArt gallery provides 241 images of corals and sea anemone in the phylum cnidaria. They attach themselves to the bottom using an adhesive 'foot', called a basal disc.

"A, Edwardsia cliparedii (after A. Andres). Cap, capitulum; sc, scapus; ph, physa. B, Transverse section of the same, showing the arrangement of the mesenteries. s, Sulcus; sl, sulculus. C, Transverse section of Halcampa. d, d, Directive mesenteries; stm stomodaeum." — The Encyclopedia Britannica, 1910

Edwardsia Cliparedii

"A, Edwardsia cliparedii (after A. Andres). Cap, capitulum; sc, scapus; ph, physa. B, Transverse section…

"In the genus Alcyonium, the polypidom is of a spongy nature, and contains a multitude of minute calcareous concretions, which serve to give firmness to the fabric. When the polypes are contracted, the surface of the polypidom, which is covered with a coriaceous skin, is seen to bear numerous scattered stellate marks, which, on examination, are found to consist of eight rays correstponding with the tentacula of the polypes which are to be protruded from these spots." — Goodrich, 1859

Alcyonium elegans

"In the genus Alcyonium, the polypidom is of a spongy nature, and contains a multitude of minute calcareous…

"Epidermo-muscular cells of Hydra m, muscular-fiber processes." — Encyclopedia Britannica, 1893

Epiderm Cels

"Epidermo-muscular cells of Hydra m, muscular-fiber processes." — Encyclopedia Britannica, 1893

"Eupsamma. A genus of perforate stone-corals, as E. brongniartiana (shown here), of the family Eupsammidae." -Whitney, 1911

Eupsamma

"Eupsamma. A genus of perforate stone-corals, as E. brongniartiana (shown here), of the family Eupsammidae."…

A hand&mdashlike coral: so called from its pale hand like tubers.

Dead Man's Fingers

A hand&mdashlike coral: so called from its pale hand like tubers.

"In the subfamily of the Zoanthidae, the polyps occur in clusters, and are multiplied by buds, rising from a common, creeping, root-like, fleshy base. This species possesses the power of considerably altering its shape; sometimes the mouth is depressed, and at others it is elevated into an obtuse cone."

Flabellum Pavonium (Lesson)

"In the subfamily of the Zoanthidae, the polyps occur in clusters, and are multiplied by buds, rising…

These animalcule are so small that 1,000,000 are equal in bulk to only one cubic inch. They appear to live in the layers of water near the surface, and after death to fall gradually to the bottom of the sea.

Foraminifera

These animalcule are so small that 1,000,000 are equal in bulk to only one cubic inch. They appear to…

"<em>Edwardsia claparedii</em> <em>Cap</em>, capitulum; sc, scapus; ph, physa. B, Transverse section of the same, showing the arrangement of the mesenteries. s, Sulcus; sl, sulculus. C, Transverse section of <em>Halcampa</em>, d,d, Directive mesenteries; st, stomodaeum." &mdash;Encyclopedia Britannica, 1910

Halcampa

"Edwardsia claparedii Cap, capitulum; sc, scapus; ph, physa. B, Transverse section…

"Portion of the surface of a colony of Heliopora coerulea magnified, showing two calices and the surrounding coenenchymal tubes." &mdash;Encyclopedia Britannica, 1910

Colony of Heliopora coerulea

"Portion of the surface of a colony of Heliopora coerulea magnified, showing two calices and the surrounding…

"A, Portion of the surface of a colony of Heliopora coerulea magnified, showing two calices and the surrounding coenenchymal tubes. B, Single zooid with the adjacent soft tissues as seen after removal of the skeleton by decalcification. Z1, the distal, and Z2, the proximal or intracalicular portion of the zooid; ec, ectoderm; ct, coenechymal tubes; sp, superficial network of solenia." &mdash; The Encyclopedia Britannica, 1910

Heliopora Corerulea

"A, Portion of the surface of a colony of Heliopora coerulea magnified, showing two calices and the…

Longitudinal section of a hydra.

Hydra

Longitudinal section of a hydra.

Cross section of a hydra.

Hydra

Cross section of a hydra.

Stinging cells of hydra, highly magnified. Cell containing thread capsule.

Hydra

Stinging cells of hydra, highly magnified. Cell containing thread capsule.

Stinging cells of hydra, highly magnified. Thread capsule partly discharged.

Hydra

Stinging cells of hydra, highly magnified. Thread capsule partly discharged.

Stinging cells of hydra, highly magnified. Thread capsule fully discharged.

Hydra

Stinging cells of hydra, highly magnified. Thread capsule fully discharged.

"Nettling cells of Hydra. A, unexploded; B, exploded; b, barbs; c, the nettling cell in which the nettling organ is developed; cn., the cnidocil or "trigger"; cp., the capsule or nettling organ; f, the nettling filament or lasso; n, neck of the capsule; nu., nucleus of the cell." &mdash; Galloway

Hydra

"Nettling cells of Hydra. A, unexploded; B, exploded; b, barbs; c, the nettling cell in which the nettling…

"Hydra hanging from water-weed." -Thomson, 1916

Hydra

"Hydra hanging from water-weed." -Thomson, 1916

"A, Longitudinal section through the body of Hydra (diagrammatic). B, small portion of the wall more highly magnified. b, bud; ect., ectoderm; ent., entoderm; f, foot; fl., flagellum; g.v., gastro-vascular cavity; m., mouth; mes., mesenchyma (non-cellular); m.f., muscular processes of the ectodermal cells; n, nettling cells; n', same, exploded; nu., nucleus; t, tentacle; v, vacuole." -Galloway, 1915

Hydra

"A, Longitudinal section through the body of Hydra (diagrammatic). B, small portion of the wall more…

In Radiata the digestive cavity is a pouch with a single opening, into which the food is passed and from which the residuum is ejected, as in the Hydra.

The Digestive Apparatus of a Hydra or Freshwater Polyp

In Radiata the digestive cavity is a pouch with a single opening, into which the food is passed and…

"Hydra vividis. ov, ovary; te, testis." &mdash; Encyclopedia Britannica, 1893

Hydra Vividis

"Hydra vividis. ov, ovary; te, testis." — Encyclopedia Britannica, 1893

"Longitudinal section of a Hydra; <em>b</em>, bud which will form a young one; <em>ba</em>, base by which it is attached when not creeping." &mdash; Davison, 1906

Section of a hydra

"Longitudinal section of a Hydra; b, bud which will form a young one; ba, base by…

"Hydractina Echinata. c, the canosarc, forming an incrustation over the object on which it lives; n, nutritive polyps; r, reproductive polyps, bearing buds in which are ova; t, tentacles." &mdash; Galloway

Hydractina Echinata

"Hydractina Echinata. c, the canosarc, forming an incrustation over the object on which it lives; n,…

"Diagram of a colony of Hydractinia, showing four forms of persons. a, hydriform person; b, modified hydriform person, or blastostyle, bearing c, degenerate medusiform persons or sporosacs; d, modified hydriform person situated at the margin of the colony (dactylozooid)." &mdash; Encyclopedia Britannica, 1893

Hydractinia

"Diagram of a colony of Hydractinia, showing four forms of persons. a, hydriform person; b, modified…

"Colony of Hydractinia on back of a Buccinum shell tenanted by a hermit-crab." -Thomson, 1916

Hydractinia

"Colony of Hydractinia on back of a Buccinum shell tenanted by a hermit-crab." -Thomson, 1916

"Diagram of a typical Hydrozoan polyp. EC., Ectoderm; EN., endoderm; C., the cavity of the gut (coelenteron); G., a reproducive bud; T., a tentacle; H., hypostome or oral cone; M., mouth." -Thomson, 1916

Hydrazoan Polyp

"Diagram of a typical Hydrozoan polyp. EC., Ectoderm; EN., endoderm; C., the cavity of the gut (coelenteron);…

"Diagram of a gymnoblastic Hydroid. a., Stem; b., root; c., gut cavity; d., endoderm (dark); e., ectoderm; f., horny perisarc; g., hydra-like "person" (hydranth); g'., the same, contracted; h., hypostome bearing mouth; k., sac-like reproductive bud (sporosac); m., a modified hydranth (blastostyle) bearing sporosacs; l., medusoid "person." -Thomson, 1916

Hydroid

"Diagram of a gymnoblastic Hydroid. a., Stem; b., root; c., gut cavity; d., endoderm (dark); e., ectoderm;…

"A, blastula in which the entoderm (ent.) is produced by proliferation from ectoderm (ect.)." -Galloway, 1915

Hydroid Blastula

"A, blastula in which the entoderm (ent.) is produced by proliferation from ectoderm (ect.)." -Galloway,…

"A. A small piece of hydroid colony. p., Perisarc; m., medusoid bud; h., hydranth or polyp head." -Thomson, 1916

Hydroid Colony

"A. A small piece of hydroid colony. p., Perisarc; m., medusoid bud; h., hydranth or polyp head." -Thomson,…

"B, ciliated planula formed by the continuance of this process. A split in the entoderm furnishes the beginning of the gastro-vascular cavity (g) of the adult." -Galloway, 1915

Hydroid Planula

"B, ciliated planula formed by the continuance of this process. A split in the entoderm furnishes the…

"C, more mature condition, in which the planula has become fixed: f, foot or attached end; o, oral or free end at which the tentacles and mouth will be developed." -Galloway, 1915

Mature Hydroid Planula

"C, more mature condition, in which the planula has become fixed: f, foot or attached end; o, oral or…

"Hydroids. IV A. Campanularian. IV B. A fragment enlarged, showing stalked hydrothecae (H.), a gonotheca (G.); C., the coenenchyma; P., the perisarc; S., a stalk." -Thomson, 1916

Campanularian Hydroid

"Hydroids. IV A. Campanularian. IV B. A fragment enlarged, showing stalked hydrothecae (H.), a gonotheca…

"Campanularian Hydroid. H., Hydrotheca or polyp-cup; HY., hydranth, or polyp-head; G., gonotheca, enclosing a reproductive polyp producing medusoid buds; M., a liberated medusoid; ST., basal stolon." -Thomson, 1916

Campanularian Hydroid

"Campanularian Hydroid. H., Hydrotheca or polyp-cup; HY., hydranth, or polyp-head; G., gonotheca, enclosing…

"Hydroids. III A. Plumularia. III B. A fragment enlarged, showing hydrothecae (H.) on one side of each twig, an axillary gonotheca (G.) and minute nematophores." -Thomson, 1916

Plumularia Hydroid

"Hydroids. III A. Plumularia. III B. A fragment enlarged, showing hydrothecae (H.) on one side of each…

"Hydroids. II A. Piece of Sertularia. II B. A fragment enlarged, showing sessile hydrothecae (H.) on both sides of the twigs." -Thomson, 1916

Sertularia Hydroid

"Hydroids. II A. Piece of Sertularia. II B. A fragment enlarged, showing sessile hydrothecae (H.) on…

"Hydroids. I. Tubularia." -Thomson, 1916

Tubularia Hydroid

"Hydroids. I. Tubularia." -Thomson, 1916

Magnified hydroid showing spore-sacs.

Hydroids

Magnified hydroid showing spore-sacs.

"Diagram showing possible modifications of persons of a gymnoblastic Hydromedusa. a, hydrocaulus (stem); b, hydrohiza (root); c, enteric cavity; d, endoderm; e, ectoderm; f, perisarc (horny case); g, hydranth (hydriform person) expanded; g', hydranth (hydriform person) contracted; h, hypostome, bearing mouth at its extremity; k, sacciform gonophor (sporosac) springing from the hydrocaulus; k', sporosac springing from m, a modified hydriform person (blastostyle): the genitalia are seen surrounding the spadix or manubrium; l, medusiform person or medusa; m, blastostyle." &mdash; Encyclopedia Britannica, 1893

Hydromedusa

"Diagram showing possible modifications of persons of a gymnoblastic Hydromedusa. a, hydrocaulus (stem);…

"Diagram showing possible modifications of the persons of a Calyptoblastic Hydromedusa. a, hydrocaulus (stem); b, hydrohiza (root); c, enteric cavity; d, endoderm; e, ectoderm; f, perisarc (horny case); g, hydranth (hydriform person) expanded; h, hypostome, bearing mouth at its extremity; i, the horny cup or hydrotheca of the hydriform persons; l, medusiform person springing from n, a modified hydriform person (blastostyle); n, the norny case or gonandium enclosing the blastostyle and its buds. This and the hydrotheca i give origin to the name Calyptoblastea." &mdash; Encyclopedia Britannica, 1893

Hydromedusa

"Diagram showing possible modifications of the persons of a Calyptoblastic Hydromedusa. a, hydrocaulus…

"Idyia roseola. Seen from the broad side, half natural size. a, anal opening; b, lateral tube; c, circular tube; d, e, f, g, h, rows of paddles." -Parker, 1900

Idyia Roseola

"Idyia roseola. Seen from the broad side, half natural size. a, anal opening; b, lateral tube; c, circular…

"A species of <em>Isis</em> has numerous slender branches, furnished with cylindrical knows at intervals, contracted toward the middle, finely striated; it has a singular resemblance to the Common Mare's Tail."

Isis Hippuris

"A species of Isis has numerous slender branches, furnished with cylindrical knows at intervals,…

"Medusiform person (Lizzia), one of the Anthomedusae, detached from a hydroid colony of the family Endendridae. Ocelli are seen at the base of the tentacles, and two medusiform buds on the sides of the manubrium." &mdash; Encyclopedia Britannica, 1893

Lizzia

"Medusiform person (Lizzia), one of the Anthomedusae, detached from a hydroid colony of the family Endendridae.…

"These winged species of polypidom are somewhat scythe-shaped, well developed, and furnished with a great quantity of pointed spiculae, which are constituted of bundles at the base of the calyx of each polyp. The polyps appear upon the waving and deeply indented lobes."

Loose Winged Virgularia (Virgularia Mirabilis)

"These winged species of polypidom are somewhat scythe-shaped, well developed, and furnished with a…

"These winged species of polypidom are somewhat scythe-shaped, well developed, and furnished with a great quantity of pointed spiculae, which are constituted of bundles at the base of the calyx of each polyp. The polyps appear upon the waving and deeply indented lobes."

Branch of Loose Winged Virgularia

"These winged species of polypidom are somewhat scythe-shaped, well developed, and furnished with a…

"The Plantain Madrepore is an interesting species, the polyps presenting themselves in tufts, with slender and prolific branches."

Madrepora Plantaginea (Lamarck)

"The Plantain Madrepore is an interesting species, the polyps presenting themselves in tufts, with slender…

"Diagram of Medusa, illustrating radial symmetry. A, viewed from the oral end of the principal axis; B, a section along the principal axis and through one of the subordinate axes aa1; o, ab. o, the oral and aboral poles of the principal axis; a, a1, and b, b1, the similar poles of the two chief subordinate axes." -Galloway, 1915

Medusa

"Diagram of Medusa, illustrating radial symmetry. A, viewed from the oral end of the principal axis;…

"Portions of sections through the disc of medusae. The upper one of Lizzia, the lower of Aurelia. el, endoderm lamelia, or vascular lamelia; m, muscular processes of the ectoderm cells in cross section; d, ectoderm; en, endoderm lining the enteric cavity; e, wandering endoderm cells of the gelatinous substances." &mdash; Encyclopedia Britannica, 1893

Medusae

"Portions of sections through the disc of medusae. The upper one of Lizzia, the lower of Aurelia. el,…

"Enlarged view of the surface of a living Millepora, showing five dactylozooids surrounding a central gastrozooid." &mdash; Encyclopedia Britannica, 1893

Millepora

"Enlarged view of the surface of a living Millepora, showing five dactylozooids surrounding a central…

"Portion of the calcareous corallum of Millepora nodosa, showing the cyclical arrangement of the pores occupied by the "persons" or hydranths." &mdash; Encyclopedia Britannica, 1893

Millepora Nodosa

"Portion of the calcareous corallum of Millepora nodosa, showing the cyclical arrangement of the pores…

A genus of the Alcyonidae.

Cydonium mulleri

A genus of the Alcyonidae.

"Muscular cells of medusae (Lizzia). The uppermost is a purely muscular cell from the sub-umbrella; the two lower are epidermo-muscular cells from the base of a tentacle; the upstanding nucloated portion forms part of the epidermal mosaic on the free surface of the body." &mdash; Encyclopedia Britannica, 1893

Muscular Cells

"Muscular cells of medusae (Lizzia). The uppermost is a purely muscular cell from the sub-umbrella;…

"Nematocyst of Hydra, showing cell-substance and nucleus, cyat, trigger hair, and everted thread." &mdash; Encyclopedia Britannica, 1893

Nematocyst

"Nematocyst of Hydra, showing cell-substance and nucleus, cyat, trigger hair, and everted thread." —…

"Ocellus of a medusa (Lizzia Koellikeri). oc, pigmented ectodermal cells; l, lens." &mdash; Encyclopedia Britannica, 1893

Ocellus

"Ocellus of a medusa (Lizzia Koellikeri). oc, pigmented ectodermal cells; l, lens." — Encyclopedia…

Oculina ranges from Cape Hatteras, North Carolina through the Gulf of Mexico and Caribbean, though the main population of concern is off east-central Florida where it forms unique thicket-type structures in 70-100 meters (230 to 330 ft) depth known as the "Oculina Banks". Colonies are arborescent, with highly clumped, irregular bushy branches.

Oculina Virginea (Lamarck)

Oculina ranges from Cape Hatteras, North Carolina through the Gulf of Mexico and Caribbean, though the…

Coral that has branched out and looks like a brain.

Astraea Pallida

Coral that has branched out and looks like a brain.

"A. Colony of Pennatula phosphorea from the metarachidial aspect. p, The peduncle. B, Section of the rachis bearing a single pinna. a, Axis; b, metarachidial; c, prorachidial; d, pararachidial stem canals." &mdash; The Encyclopedia Britannica, 1910

Pennatula Phosphorea

"A. Colony of Pennatula phosphorea from the metarachidial aspect. p, The peduncle. B, Section of the…

"Colony of <em>Pennatula phosphorea</em> from the metarachidial aspect. p, The peduncle. B, Section of the rachis bearing a single pinna. A, Axis; b, metarachidial; c, prorachidial; d, pararachidial stem canals." &mdash;Encyclopedia Britannica, 1910

Colony of Pennatula phosphorea

"Colony of Pennatula phosphorea from the metarachidial aspect. p, The peduncle. B, Section…

"Diagram of an Ectoproctous Polyzoon (Plumatella). L., Lophophore; PH., pharynx; A., anus; S., stomach; M., retractor muscle; F., funiculus, a cord of mesodermic tissue; O., cells that form "statoblast" buds; B., an ordinary bud; E., epistome over the mouth; T., tentacles; Sh., outer wall of zooecium." -Thomson, 1916

Plumatella

"Diagram of an Ectoproctous Polyzoon (Plumatella). L., Lophophore; PH., pharynx; A., anus; S., stomach;…

A colony of polyps on a bit of seaweed.

Polpys

A colony of polyps on a bit of seaweed.

Obelia, a simple polyp, vertical section, highly magnified, m = mouth opening, as.s = alimentary sac

Polyp

Obelia, a simple polyp, vertical section, highly magnified, m = mouth opening, as.s = alimentary sac

"A hydroid colony of six polyps; f, feeding polyp; r, reproductive polyp; m, a medusa." &mdash;Davison, 1906

Polyp

"A hydroid colony of six polyps; f, feeding polyp; r, reproductive polyp; m, a medusa." —Davison,…