Crab and snail ID?

[Afkomjorgen]

Crab came in on an order of Green Emerald Crabs
Snail came in with an order of Astrea snails

Any ids? Both are in my sump now

 

[kjkszpj9]

The crab looks like some kind of spider crab or a porcelain crab, it looks like it has only 3 pair of legs instead of 4 which it instead has 1 pair of different legs on the back of it.