True Jellies are called Scyphozoans.  
Other similar organisms are:
Hydrozoa     Cubozoa
Anthozo
All 4 major groups are Cnidarians.
All have stinging cells thought to have
come from a common ancestor.
Ctenophora have no stinging cells but are a close relative.
Watch out for jellies (jellyfish) that are laying
on the sand; some like the man-of-war can
cause painful stings.

Others are not dangerous to people,
but it's best not to handle them
or touch your face or eyes if
you've been touching beached
individuals since some irritation
may result.
"Jellyfish Lake" is an interesting aspect of how
jellies developed after becoming isolated in a lake
environment.
Pictures and story

This Wikipedia link also has a YouTube video link.
Image taken Feb. 13, 2004 by Jeremy Green
"By-the-wind-sailor"  (Velella velella) is commonly found on the surface of
the warmer waters of the World's oceans, and often washes onshore.
This photo is at Oceano dunes, California
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