From ZooTerms (Dictionary of Invertebrate Zoology)
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umbrella (noun; Latin diminutive umbra, shade): 1. Any umbrella-shaped structure.

2. The ectodermal cells located anterior to the preoral band of cilia in the development of a trochophore larva.

3. (Cnidaria: Scyphozoa) The deep to shallow bowl like body of a medusa or jellyfish; the bell

See also: exumbrella, subumbrella. 4. (Mollusca: Cephalopoda) The velum or interbrachial web interconnecting the head and arms of the finned octopods.