If you look along the edge of the frill, they have these little triangular bones that actually grow big as triangles and then they flatten against the frill pretty much like the spikes do on the Pachycephalosaurs.
Ako pogledate uz rubove nabora, oni imaju te male trokutne kosti koje zapravo rastu kao trokuti a onda se spljošte uz nabor što je dosta slično onome što se događa sa šiljcima kod Pachycephalosaura.