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A free-swimming jellyfish of the Class Scyphozoa.

Jellyfish

A free-swimming jellyfish of the Class Scyphozoa.

Jellyfish are generally of the hydrozoa family.

Jellyfish

Jellyfish are generally of the hydrozoa family.

The head of Medusa from the Farnese dish (onyx patera) Naples Museum.

Medusa Head

The head of Medusa from the Farnese dish (onyx patera) Naples Museum.

The head of Medusa from center of an antique patera, Roman.

Medusa Head

The head of Medusa from center of an antique patera, Roman.

The head of Medusa from a French medallion.

Medusa Head

The head of Medusa from a French medallion.

The head of Medusa as a grotesque from a tympanum in Paris.

Medusa Head

The head of Medusa as a grotesque from a tympanum in Paris.

"One of the Acalephae; a name given to a large number of marine animals; and redpresenyted chiefly by medusidae."-Whitney, 1902

Acaleph

"One of the Acalephae; a name given to a large number of marine animals; and redpresenyted chiefly by…

"Distinguished by their habit of forming a tube or case, within which the soft parts of the animal can be retracted. This tube is usually attached to stones or other submarine bodies. It is often composed of carious foreign materials, such as sand, small stones, and the debris of shells, lined internally with a smooth covering of hardened mucus." — Goodrich, 1859

Terebella medusa

"Distinguished by their habit of forming a tube or case, within which the soft parts of the animal can…

The terebella medusa, out of its case.

Terebella medusa out of its case

The terebella medusa, out of its case.

"This may be considered as one of the greatest wonders of nature, it being a real animal, having blood, and feeding upon other marine animals, yet having the form of a plant, and living like a plant, fixed to a rock in the deep sea." — Goodrich, 1859

Medusa's head pentacrinus

"This may be considered as one of the greatest wonders of nature, it being a real animal, having blood,…

"One of the commonest species, and must have been observed by those who frequent the sea-shore. In the water the creature swims along most gracefully by the contractoin and dilatation of its transparent disk." — Goodrich, 1859

Medusa, aurita

"One of the commonest species, and must have been observed by those who frequent the sea-shore. In the…

Four representations of men with ensis falcati.

Ensis falcatus

Four representations of men with ensis falcati.

"Medusa" — Gayley, 1893

Medusa

"Medusa" — Gayley, 1893

"Medusa" — Gayley, 1893

Medusa

"Medusa" — Gayley, 1893

"Perseus" — Gayley, 1893

Perseus

"Perseus" — Gayley, 1893

"Perseus with Head of Medusa" — Gayley, 1893

Perseus

"Perseus with Head of Medusa" — Gayley, 1893

"Vacnolated endoderm cells of eartilaginous consistence from the axis of the tentacle of a Medusa (Cunina)." — Encyclopedia Britannica, 1893

Endoderm Cell

"Vacnolated endoderm cells of eartilaginous consistence from the axis of the tentacle of a Medusa (Cunina)."…

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

Ocellus

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

"Gradual degeneration of the medusa bud into the form of a sporosae. The black represents the enteric cavity and its continuations; the lighter shading represents the genital products (ova or sperm). Medualform person still attached by a stalk at the aboral pole to a colony." — Encyclopedia Britannica, 1893

Sporosae

"Gradual degeneration of the medusa bud into the form of a sporosae. The black represents the enteric…

"Gradual degeneration of the medusa bud into the form of a sporosae. The black represents the enteric cavity and its continuations; the lighter shading represents the genital products (ova or sperm). Modified medusiform person, with margin of the disc (umbrella) united above and importforato (mouthless) manubrium." — Encyclopedia Britannica, 1893

Sporosae

"Gradual degeneration of the medusa bud into the form of a sporosae. The black represents the enteric…

"Gradual degeneration of the medusa bud into the form of a sporosae. The black represents the enteric cavity and its continuations; the lighter shading represents the genital products (ova or sperm). Sporosac, with imcomplete extension of the enteric cavity into the umbrella,-rudimentary invagination above to form the sub-umbrella cavity." — Encyclopedia Britannica, 1893

Sporosae

"Gradual degeneration of the medusa bud into the form of a sporosae. The black represents the enteric…

"Gradual degeneration of the medusa bud into the form of a sporosae. The black represents the enteric cavity and its continuations; the lighter shading represents the genital products (ova or sperm). Sporosac with manubrial portion only of the enteric cavity." — Encyclopedia Britannica, 1893

Sporosae

"Gradual degeneration of the medusa bud into the form of a sporosae. The black represents the enteric…

"Gradual degeneration of the medusa bud into the form of a sporosae. The black represents the enteric cavity and its continuations; the lighter shading represents the genital products (ova or sperm). Sporosac without any trace of manubrium." — Encyclopedia Britannica, 1893

Sporosae

"Gradual degeneration of the medusa bud into the form of a sporosae. The black represents the enteric…

"Two female sporosacs (degenerate medusae) of Hydraetinia echinata. a, ectoderm; b, endoderm; o, eggcella; g, entric cavity. In A an invagination of the ectoderm, which is more complete in B, represents the rudiment of the sub-umbrella space." — Encyclopedia Britannica, 1893

Sporosac

"Two female sporosacs (degenerate medusae) of Hydraetinia echinata. a, ectoderm; b, endoderm; o, eggcella;…

"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." — Encyclopedia Britannica, 1893

Hydromedusa

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

"A, a hydriform person giving rise to medusiform persons by budding from the margin of the disc; B, free swimming medusa (Steenstrupia of Forbes) detached from the same, with manubrial genitalia (Anthomedusae) and only one tentacle." — Encyclopedia Britannica, 1893

Corymorpha

"A, a hydriform person giving rise to medusiform persons by budding from the margin of the disc; B,…

"The under surface, showing the mouth in the center, surrounded by the tentacula, and overial chambers exterior to the origins of these." — Chambers' Encyclopedia, 1875

Acalephae

"The under surface, showing the mouth in the center, surrounded by the tentacula, and overial chambers…

"Side-view, showing the tentacula hanging down in their natural position." — Chambers' Encyclopedia, 1875

Acalephae

"Side-view, showing the tentacula hanging down in their natural position." — Chambers' Encyclopedia,…

"a, tentacula; b, mouth; c, termination of intestine." — Chambers' Encyclopedia, 1875

Beroe

"a, tentacula; b, mouth; c, termination of intestine." — Chambers' Encyclopedia, 1875

"Physalia has no proper mouth, but the food is conveyed to the digestive cavity through a number of flask like appendages, which hang down beneath, each having an orifice and a sort of sucker." — Chambers' Encyclopedia, 1875

Physalia

"Physalia has no proper mouth, but the food is conveyed to the digestive cavity through a number of…

"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,…

The Radiate, Acaleph; a Medusa from the genus Tiaropsis.

Acaleph Radiate

The Radiate, Acaleph; a Medusa from the genus Tiaropsis.

"Diagrams showing some of the stages in the increasing complexity of the simple eye in Invertebrates. A, simple pigment spot in epithelium having nerve-endings associated with pigment cells (as in some medusae); B, pigment cells in a pit-like depression (as in Patella); C, with pin-hole opening and vitreous humor in cavity (as in Trochus); D, completely closed pit, with lens and cornea (as in Triton and many other Mollusks); E, pigment area elevated instead of depressed, lens of thickened cuticula (as in the Medusa, Lizzia); F, retinal cells more highly magnified. ep., epidermis; f, nerve fibre; l, lens; op, optic nerve; p, pigment cells; r, retina; v.h., vitreous humor." -Galloway, 1915

Invertebrate Simple Eye

"Diagrams showing some of the stages in the increasing complexity of the simple eye in Invertebrates.…

"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;…

"Bougainvillea ramosa. A, entire colony, natural size; B, portion of the same magnified; C, immature medusa; cir. c, circular canal; cu, cuticle or perisarc; ent. cav, enteric cavity; hyd. polype or hydranth; hyp, hypostome or manubrium; med, medusa; mnb, manubrium; rad. c, radial canal; t, tentacle; v, velum." -Parker, 1900

Bougainvillea Ramosa

"Bougainvillea ramosa. A, entire colony, natural size; B, portion of the same magnified; C, immature…

"They usually inhabit the deep seas. They are rarely solitary, but seem to wander about in considerable battalions in the latitudes to which they belong."

Fleet of Medusa

"They usually inhabit the deep seas. They are rarely solitary, but seem to wander about in considerable…

Euphorbia caputmedusae or the Medusa's Head is a spurge from the diverse genus, Euphorbia.

Medusa's Head Spurge

Euphorbia caputmedusae or the Medusa's Head is a spurge from the diverse genus, Euphorbia.

The Farnese Dish Medusa Head is an onyx patera, or black dish. It is a Roman design.

Farnese Medusa Head Dish

The Farnese Dish Medusa Head is an onyx patera, or black dish. It is a Roman design.

The Antique Patera Medusa Head design comes from the center of a dish. It is a Roman design.

Antique Patera Medusa Head

The Antique Patera Medusa Head design comes from the center of a dish. It is a Roman design.

This Medallion Medusa Head is a French design.

Medallion Medusa Head

This Medallion Medusa Head is a French design.

The Tympanum Medusa Head is found in the arch of the entrance of the Royal Palace of Tuileries in Paris, France.

Tympanum Medusa Head

The Tympanum Medusa Head is found in the arch of the entrance of the Royal Palace of Tuileries in Paris,…

Colonial, plant-like animals closely related to jellyfish, with stinging cells, Any member of the invertebrate order Hydroida (class Hydrozoa, phylum Cnidaria). Hydroids have three basic life-cycle stages: (1) a tiny free-swimming planula larva about 1 mm (0.04 inch) long, which settles and grows into (2) a sessile (attached), usually colonial hydroid stage, which in turn liberates (3) medusa.

Medusa of a Hydroid

Colonial, plant-like animals closely related to jellyfish, with stinging cells, Any member of the invertebrate…

An illustration of a coin with the face of Perseus of Macedonia. Perseus the legendary founder of Mycenae and of the Perseid dynasty there, was the first of the mythic heroes of Greek mythology whose exploits in defeating various archaic monsters provided the founding myths in the cult of the Twelve Olympians. Perseus was the hero who killed Medusa and claimed Andromeda, having rescued her from a sea monster.

Perseus of Macedonia Coin

An illustration of a coin with the face of Perseus of Macedonia. Perseus the legendary founder of Mycenae…

Perseus, the legendary founder of Mycenae and of the Perseid dynasty there, was the first of the mythic heroes of Greek mythology whose exploits in defeating various archaic monsters provided the founding myths in the cult of the Twelve Olympians. Perseus was the hero who killed Medusa and claimed Andromeda, having rescued her from a sea monster.

Perseus

Perseus, the legendary founder of Mycenae and of the Perseid dynasty there, was the first of the mythic…