April showers bring . . . a slug or a snail?

Spotted this snail under the peach tree, working hard to crawl up on to a blade of grass.  Do you see his extended body and antennae?

Almost situated

Success! 

And I learned something:

Slugs and snails are generally distinguished by the presence of a large exterior shell on the back of snails. Snails and slugs are both gastropod mollusks, and unlike most gastropods they are terrestrial i.e. found on land.

 

So what we have here is a snail.