Notes on Some Hydromedusae From the Bay of Naples (Classic Reprint) - Hardcover

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Excerpt from Notes on Some Hydromedusae From the Bay of Naples

Medusa piriform, with prominent apical projection. Size 2 mm high by mm broad. Velum narrow, velar opening very small. Manubrium rather large, conical and devoid of peduncle. Bell very transparent, with scattered nematocysts over the exumbrellar surface. Radial canals lacking, marginal canal simply a fissure of varying size between the layers of ectoderm with vestiges of entodermal lining near the margin. Tentacles entirely lacking. The medusa is devoid of color except on the manubrium, which varies from orange to dark brown. Mouth wholly lacking. When first liberated the medusa swims with a short, jerky motion, tho of limited vigor, a few contractions appearing to exhaust the little creature. Eggs are discharged almost immediately after the birth of the medusa.

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