ClipArt ETC
"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."

"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…