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"Corallium rubrum, a corner of a colony. A., Anthocodia or retractile portion of a polyp; r.p., completely retracted polyp, with the verruca or calyx portion left protruding; C., coenenchyma; T., pinnate tentacles." -Thomson, 1916

C. Ruburm

"Corallium rubrum, a corner of a colony. A., Anthocodia or retractile portion of a polyp; r.p., completely…

Compound coral head with polyps partly expanded and partly contracted. The expanded polyps show the tentacles which surround the mouth; the contracted polyps show the polygonal outline from crowding.

Coral Head

Compound coral head with polyps partly expanded and partly contracted. The expanded polyps show the…

A compound coral head with crowded prismatic corallites. The specimen represents a worn pebble, formerly a part of a larger head.

Coral Head

A compound coral head with crowded prismatic corallites. The specimen represents a worn pebble, formerly…

A coral in the shape of a mushroom.

Mushroom Coral

A coral in the shape of a mushroom.

Coral that resembles a pipe-organ.

Organ-Pipe Coral

Coral that resembles a pipe-organ.

Used for jewellery, grows in a bushy form on rocks at the bottom of the Mediterranean and Red seas.

Red Coral

Used for jewellery, grows in a bushy form on rocks at the bottom of the Mediterranean and Red seas.

If undisturbed, the body and tentacles may occasionally sway gently. If disturbed, a hydra usually shortens until it is a tiny ball.

Hydra

If undisturbed, the body and tentacles may occasionally sway gently. If disturbed, a hydra usually shortens…

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.

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…

"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." — Galloway

Hydractina Echinata

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

The branch of a Passion Flower.

Passion Flower

The branch of a Passion Flower.

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." —Davison, 1906

Polyp

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

An individual coral is known as a polyp. They resemble sea anemone, as they have tubular bodies with tentacles. This is a cluster of New England coral polyps.

Coral Polyp

An individual coral is known as a polyp. They resemble sea anemone, as they have tubular bodies with…

An individual coral is known as a polyp. They resemble sea anemone, as they have tubular bodies with tentacles. This is a cluster of red coral polyps.

Coral Polyp

An individual coral is known as a polyp. They resemble sea anemone, as they have tubular bodies with…

Vertical section through a polyp. Mouth surrounded by tentacles and beneath it the "stomatodaeum."

Vertical Section Through a Polyp

Vertical section through a polyp. Mouth surrounded by tentacles and beneath it the "stomatodaeum."

The Sea Pansy (Renilla reniformis) is a sea pen in the Renillidae family. Shown here with a single polypite, the sea pansy is common to Florida beaches.

Sea Pansy

The Sea Pansy (Renilla reniformis) is a sea pen in the Renillidae family. Shown here with a single polypite,…

The Sea-Fir (Sertularia tubitheca) is mistaken as a plant but is actual a hydrozoan animal of the phylum Cnidaria.

Sea-Fir

The Sea-Fir (Sertularia tubitheca) is mistaken as a plant but is actual a hydrozoan animal of the phylum…