Thanks to Jim Farlow and Tracy Ford I can confirm that the Molnar MS is... Molnar, R. E. 1977. Analogies in the evolution of combat and display structures in ornithopods and ungulates. _Evolutionary Theory_ 3, 165-190. -- Darren Naish School of Earth & Environmental Sciences University of Portsmouth UK, PO1 3QL email: darren.naish@port.ac.uk tel: 023 92846045