By-the-wind Sailor

While members of the phylum Cnidaria are typically referred to as jelly"fish" they are not fish but rather an aquatic invertebrate. So I moved your "jellyfish" spotting to the category "other". :-)

Thank you. I thought they were so interesting.

Think I just found it 'Velella velella' http://jellieszone.com/velella.htm

Wow! What a sighting! I hope to learn what this is...