Much of Saint-Saens' music is free from the constraints of classical form. This symphony is quite unusual and yet interesting, using an organ and 2 pianos. These few bars are only a short excerpt from the 3rd movement of this symphony, and this theme was used in various arrangements by Nigel Westlake in the film Babe. They are arranged here for piano or keyboard. You might also want to see the full orchestral version.
If you can't see music above, then install the easy to use Scorch Plug-in from Sibelius software.