HCA: Hermit Crab Association

We've had our two crabs for a few weeks and are still buying supplies. I am still trying to ID them. So far I have only got good pictures of the biggest one. Any help would be great. Thanks. Type? Gender?

https://app.photobucket.com/u/Sodisco42 ... f573eda7d2

https://app.photobucket.com/u/Sodisco42 ... f573eda7d2

https://app.photobucket.com/u/Sodisco42 ... f573eda7d2

https://app.photobucket.com/u/Sodisco42 ... f573eda7d2

They're an E! Also, we need a clearer picture of the bottom last set of legs. If there's two dots it's a female, if they're absent it's a male- it's not a clear enough or close enough picture for me to tell.

I'll see if I can get a better picture. Thanks.