What's the difference between nectocalyx and nectophore?

Nectocalyx

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Definition:

• (n.) The swimming bell or umbrella of a jellyfish of medusa.
• (n.) One of the zooids of certain Siphonophora, having somewhat the form, and the essential structure, of the bell of a jellyfish, and acting as a swimming organ.

Example Sentences:

Nectophore

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Definition:

Example Sentences:

• (1) Slow swimming in Aglantha apparently involves a second nerve supply to the same muscle sheets used in rapid swimming, whereas in Chelophyes slow swimming results from the activity of the smaller posterior nectophore.