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"The <em>Hydra Viridis</em> is another freshwater polyp, common to ponds and still waters Sometimes the green hydra inhabits brooks filled with herbage." This image shows the Hydra bearing an embryo ready to detach itself.

Hydra Viridis

"The Hydra Viridis is another freshwater polyp, common to ponds and still waters Sometimes…

"The <em>Hydra Vulgaris</em> inhabits stagnant ponds and slow running waters."

Hydra Vulgaris

"The Hydra Vulgaris inhabits stagnant ponds and slow running waters."

"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…

"The <em>Porpitae</em> consist of colonies of floating animals furnished with a cartilaginous, horizontal and rounded skeleton, but they are destitute of crest or veil."

Porpita Pacifica

"The Porpitae consist of colonies of floating animals furnished with a cartilaginous, horizontal…

"These fragile creatures are able to make long voyages on the surface of the sea. Their nature is such that they are required to keep constantly moving in order to sustain themselves in the fluid which they inhabit. There is a double movement of their light skeletons, which may be compared to the action of respiration in the human hest."

Rhyzostoma Cuvierii

"These fragile creatures are able to make long voyages on the surface of the sea. Their nature is such…