Tell me what you think of it and if i got a good deal?
Seriously, it is very unhealthy, not sure why these other guys are trying to shine you on...luckily for you though, I happen to be an expert in clams and can get it back into good health for you, just send it to me. I wouldn't do this for just anyone
It is gaping a bit, but that is a normal stress reaction for the clam, make sure it is stable and has something to attatch to, and it should be fine within a day or two. From that pic, it does look like a maxima, but I would like to see a shot of the shell from the side, to be sure.