Forget everything you've read in your high school biology text book! THIS is the correct anatomy of a turtle.
Between the carapace (the upper shell) and the plastron (that's the lower shell that encases the belly) of your favorite chelonian (that's fancy Latin word for, you guessed it, turtles) are 32 individual items including hoses, gaskets and screws! Without any digestive system, it's amazing how turtles could poop so much (just take it from my personal experience, turtles poop. A lot. If you don't find poop in your turtle's cage, perhaps its eating said poop.)
And for all you literalists, relax! It's just the schematics of the cute Polaris Turtle pool cleaner.