Elysia log
On the fourth planet, go to the room with the entrance to the skyway (not the one where the Marines meet you; it is the one before that). After getting the shield for the acid rain, go back through the Morph Ball hole next to the fans. You must jump to the green ledge to enter it. Follow it back to the top. When you get out, look around the upper level. You could not get this before because of the acid rain.