Help with crab Identification

[Fairhaven Crabber]

Sorry I don't have any pics, I almost had one, but didn't get it in time.  I will do my best to describe this one and you all see if you can ID it for me:

I caught this crab walking along the sandy ocean floor in Cape Cod this past weekend, in about 4-5 feet of water.  I think it was the one that pinched me on the foot.  Had pretty big claws and it's shell was about half the size of my palm.  It LOOKED like a maine rock crab, or dungeoness crab, except for the fact that unlike dungeoness crabs, who have 8 POINTY legs, this crab had two swimmer type legs on the back two, much like a blue crab.  It was almost like a blue crab and rock crab had a baby and that's what it was.  Anyone know what this crab is? 

[jefftoleft]

Maybe a Jonah crab hard to say without a picture look on this website see if you can find it http://www.mikedelaney.org/CrabPhotos.html

[Fairhaven Crabber]

some good pics, but nope, not any one of them,.  maybe I stumbled on a hybrid crab and just did't know!  def had swimmers as the back two legs.

[robc22]

Jonah wouldn't be that shallow.......its not a warm water crab and has no swimmers........my guess........lady crab, has swimmers and likes shallow, sandy hard bottom and is VERY aggressive when bothered

http://en.wikipedia.org/wiki/Lady_crab

[Fairhaven Crabber]

WOO HOOO! that's it man! thanks for the investigation! here she is!  she was mad when i stepped on her for sure, and when i put her on the sandy shoreline to go back into the ocean, she burrowed into the sand in about 2 seconds, crazy fast!

http://www.bio.umass.edu/biology/kunkel/fish/albatross-iv/al0509/AL050910.JPG

[crabeezle]

thats a cool looking crab