New to shelling, need IDs please

[wateryworld]

Thank you SO MUCH! 

I guess I made the mistake, though, of not being specific and requesting common names for these as well.  My google-fu is weak, and I can't always find it when looking up the latin.  For example, Cepaea nemoralis in google comes up with three names;  grove snail, brown-lipped garden snail, and banded snail, but most don't come up with anything at all.  Which one is it?  Wiki doesn't always help either. 

What is the common name for:
Pitar lupanaria
Cancellaria oblonga
prunum prunum
Tegula viridula
Olivancillaria gibbosa?

Is Viviparus malleatus the chinese mystery snail or trapdoor snail?
Is Achatina fulica the giant african land snail?
Is Nassarius luridus the dog whelk?

For future reference, what do you suggest I type in to Google, or what specific sites to go to, to find common names?