Fig. 2.

Illustration (A) and photograph (B) of the ventral view of an ankylosaurid skull roof (UALVP 47977, Euoplocephalus) from the Dinosaur Park Formation (Campanian, Upper Cretaceous), southern Alberta. Hatched lines indicate parts reconstructed with plaster. Impressions of the soft tissues, including the main airway, nasal arteries, and possible turbinates, are well defined. The ethmoidal elements are well ossified and separate regions of the nasal cavity from each other. No sutures are visible. aw, anterior wall of the cavity for the olfactory region; cor, cavity for the olfactory region; ls, laterosphenoid; od, orbital depression; sl, sulcus associated with the groove in the olfactory region. For other abbreviations, see Fig. 1.