Metridium

Members of the genus Metridium, also known as plumose anemones, are sea anemones found mostly in the cooler waters of the northern Pacific and Atlantic oceans. They are characterized by their numerous threadlike tentacles extending from atop a smooth cylindrical column, and can vary from a few centimeters in height up to one meter or more. In larg...
Found on http://en.wikipedia.org/wiki/Metridium

Metridium

(from the article `nervous system`) ...some species nerve fibres course along the radial canals, where there may be arranged sensory bodies, called rhopalia, which contain ganglionic ...
Found on http://www.britannica.com/eb/a-z/m/81
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