Looks like a slipper limper, BUT....

Yes. It's a Hipponix, or a relative. They hitch a ride on the snail and then scavenge. The only possible harm is that they dissolve part of the host's shell to make their attachments more stable. As long as it's attached, it's no problem. If it dies or gets knocked off, it may leave an exposed hole in the shell.
 
http://www.reeflex.net/tiere/3360_Hipponix_sp.htm
42846_2XXheV3fat.jpg
 
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