ClipArt ETC
The narrow-leaved arrowhead.

Arrowheads

The narrow-leaved arrowhead.

"The polyp itself is formed of a whitish, membranous tube, nearly cylindrical, having an upper disk, surrounded by its eight tentacula, bearing many delicate pinnae spreading out laterally. These tentacula resemble the corolla of some flower."

Coral Polyp (Lacaze-Duthiers)

"The polyp itself is formed of a whitish, membranous tube, nearly cylindrical, having an upper disk,…

"The arms of the polyps are at times subject to violent agitation, and the tentacula become much excited. If this excitement continues, the tentacula can be seen to fold and roll themselves up. The little opening around which these tentacula are attached forms the mouth of the polyp."

Coral Polyp (Lacaze-Duthiers)

"The arms of the polyps are at times subject to violent agitation, and the tentacula become much excited.…

"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,…

"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…

Two species of the pickerel weed family: right, pickerel weed (Pontederia cordata); left, mud plantain (Heteranthera reniformis).

Pickerel Weeds

Two species of the pickerel weed family: right, pickerel weed (Pontederia cordata); left, mud plantain…

"The <em>Fan Gorgon</>, from the Antilles; it often attains a height of eighteen or twenty inches. The resemblance of its network to fine lace gives rise to its name of <em>Sea-Fan</em>."

Magnified Portion of Fan Gorgon

"The Fan Gorgon, from the Antilles; it often attains a height of eighteen or twenty inches. The…

"The <em>Fan Gorgon</>, from the Antilles; it often attains a height of eighteen or twenty inches. The resemblance of its network to fine lace gives rise to its name of <em>Sea-Fan</em>."

Gorgonia Flabellum

"The Fan Gorgon, from the Antilles; it often attains a height of eighteen or twenty inches. The…

"The <em>Fan Gorgon</>, from the Antilles; it often attains a height of eighteen or twenty inches. The resemblance of its network to fine lace gives rise to its name of <em>Sea-Fan</em>. The Whorled Gorgon, which is found in the Mediterranean, is of elegant form."

Gorgonia Verticellata

"The Fan Gorgon, from the Antilles; it often attains a height of eighteen or twenty inches. The…

"The <em>Fan Gorgon</>, from the Antilles; it often attains a height of eighteen or twenty inches. The resemblance of its network to fine lace gives rise to its name of <em>Sea-Fan</em>. The Whorled Gorgon, which is found in the Mediterranean, is of elegant form."

Magnified Portion of Gorgonia Verticellata

"The Fan Gorgon, from the Antilles; it often attains a height of eighteen or twenty inches. The…

"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. This figure shows one which inhabits the Mediterranean Sea."

Pennatula Spinosa

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

"The <em>Tubipora</em> is a calcareous coral, formed by the combination of distinct, regularly arranged tubes, connected together at regular distances by lamellar expansions of the same material." This figure shows the crown of delicately fringed tentacula of a individual polyp.

Crown of Delicately Fringed Tentacula of Tubipora Musica

"The Tubipora is a calcareous coral, formed by the combination of distinct, regularly arranged…

"The <em>Umbellularia Groenlandica</em> has a very long stem, which is terminated at the summit only by a cluster of polyps. It is an inhabitant of the northern seas."

Umbellularia Groenlandica (Lamarck)

"The Umbellularia Groenlandica has a very long stem, which is terminated at the summit only…

"The species shown in this figure has a simple, cylindrical body, without branchiae, and a rudimentary polypidom furnished with very large polyps of a whitish color."

Veretillum Cynomorium (Lamarck)

"The species shown in this figure has a simple, cylindrical body, without branchiae, and a rudimentary…