.The reason she laid them scattered about the cage is she was unable to find a suitable nest site. Panthers are very particular about where they will lay there eggs and if they can't find a soil that is the right moisture content, right temp etc. they will either become eggbound, which usually leads to death if not treated surgically by a vet or they will scatter the eggs about the cage like yours did.
Now for their incubation...Keep them at room temp or even a bit cooler (high 60s up to about 71) for the first two months then gradually (over a weeks period or so) bring them up to around 76 (no hotter than 78) and they should hatch in 7-10 months. This species requires a diapause, i.e. low temps in the beginning, so as to simulate their natural conditions of a "winter" (not a real winter in Madagascar lol) Hope that helps