Other than a spine, do sharks (and relatives) have any other skeletal structure?

Title says it all.

This page has a picture of a shark skeleton at the bottom.

You may find your answer in this recent thread - Are sharks actually fish?

Dang, Orual beat me to it and did it better.

For everything you want to know about sharks (and fish in general), check out the Florida Museum of Natural History Ichthyology Department.