"Pond Newbie" wrote in message
...
Some are "good" and some are "bad". The ones here are tiny teardrop shaped
black snails.
I was wondering if those are the good kind.
Perhaps someone in the group will advise us both. 
snip
This site is pretty thorough...
http://www.molluscan.com/shellimages/
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BV.
www.iheartmypond.com