What kind of lighting do you have? It's lieing on it's side for 1 of 2 reasons. First is that something may be bothering it; second is that it is getting to much light.
The thing that I notice is between the first and second fold on the opposite side facing the camera, isn't extending all the way over the shell. What else is in the tank? The first fold even looks like it is missing a small chunk.
Here is the third thing, it MIGHT be a Crocea. Chances are about 50/50, but I can not see the incurrent siphon. It has a similar coloration pattern, and I have seen dozens of Croceas that have scutes.