Transparent skull with olfactory turbinates (purple),partial brain endocast (blue), cranial nerves (yellow), and partial endosseous labyrinth (pink). This model accompanies the Visible Interactive Pachycephalosaur website on the WitmerLab at Ohio University site: http://bit.ly/2ekqtpO. The specimen is the partial skull of the pachycephalosaurian dinosaur Sphaerotholus edmontonensis (MRF 360), collected from the Hell Creek Formation of North Dakota, and housed at the Marmarth Research Foundation. Our team published on this specimen in 2014 in an article by Jason Bourke, Ruger Porter, Ryan Ridgely, Tyler Lyson, Emma Schachner, Phil Bell, and Lawrence Witmer (http://bit.ly/1p5x0Ip). This research was funded in part by U.S. National Science Foundation grants to Witmer and Ridgely.