Well, here are pics of a dungeness crab:(http://www.enn.com/enn-news-archive/1999/06/060199/dungeness.jpg)
A jonah crab: (http://www.glf.dfo-mpo.gc.ca/sci-sci/crab-crab/images/ph_crab_jonahcrab.jpg)(http://www.gotosnapshot.com/jonah-crab/cwdata/CRA-01-HS006-002.jpg)
and a stone crab: (http://www.ifcstonecrab.com/images/stonecrab.gif)
I know that the crabs I bought up in RI, and the ones in the supermarket tanks are definately NOT Stone Crabs. They get stone crabs sown here here I'm at in FL, and there's no way that they are the same.
Dungeness and Jonah crabs look pretty much simliar, so I'm not sure which are which. The supermarkets marketed the crabs as Dungeness, so I don't know if they actually were Dungeness, or they were lying. Either way, the crabs were the same ones I bought off the boats, and they are Definatley NUTS for selling them at that high of a mark-up price.
I just looked for the ranges of the dungeness and the jonah crab, and it appears that they crabs I bought off the boats and what they sell in the supermarkets are actually Jonah Crabs. Their range is from Nove Scotia to Florida. Looks like another case of the supermarkets selling something and calling it by a different name so people will spend tons of money on it.