>I have a lot of snails and I'm wondering if they're good or bad for plants.
>There are two kinds:  ones that are kinda brown upto about a cm in length and
>the shell is a spiral, cone shape.  These look like pretty ordinary type 
>and don't reproduce as often as the other ones.  They are small, 1mm -3mm in
>size, semi-transparent shells in a spiral, disk shape. 

The first type of snails you describe sound like pond snails.  I've seen these 
munch on plants, and I think they are destructive and a nuisance.

The second type of snails you mention sound somewhat like limpets.  I don't 
know much about these, so I won't offer any information.

Hopefully, someone else will be able to more accurately identify your snails.

David W. Webb
Enterprise Computing Provisioning
Texas Instruments Inc.
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