I've included a few pictures of a strange object I found on the beach of Catalina Island off the coast of California. It is aproximately 50mm wide x 25mm tall x 15mm thick. I've become a little obsessed with finding out what this is, and have had no luck. Any help would be greatly appreciated!
Agree with Quagga,it looks just like the pharyngeal plate of a fish (check google images with "pharyngeal tooth plate").Having little idea how they work I'm surprised to see the 'dentition' on both sides, & can only assuse the 2nd picture shows the 'roots' of the teeth.