Is XI.—On the metamorphoses of the prawns. (First Memoir) in the public domain?

Yes. "XI.—On the metamorphoses of the prawns. (First Memoir)" by Fritz Müller is in the public domain in the United States, which means it's free to read, download, and distribute. The full text is available free on Lex with no signup required.

Can I read XI.—On the metamorphoses of the prawns. (First Memoir) online for free?

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Is there a free audiobook of XI.—On the metamorphoses of the prawns. (First Memoir)?

"XI.—On the metamorphoses of the prawns. (First Memoir)" does not currently have a free audiobook available on Lex, but you can read the full text for free online.