Einiosaurus has a dense boss where the supraorbital horns were in previous Centrosaurines and the nasal horn is exceedingly large but very forward curving and shows a large reduction in physical height from base to tip. Einiosaurus was preceded by Styracosaurus in the family, which had the largest nasal horns of the group, and the reduction of the horn in the way that it occurs seems quite random until we look at the skulls of Achelousaurus. Achelousaurus possesses a very stunted horncore that, in many interpretations, is argued to be simply the edge of the boss on the nasal region, but in the youngest skull discovered (age-wise, not geologically) appears to be a forward, straight off of the nasal and above the beak of the skull, jutting miniscule nasal; following the reduction trend and followed by the extremely dense nasal boss of the Pachyrhinosaurs. Seeing the trends in sequence (perhaps I will play with this sometime when I have more time) would be fantastic. The morphology of the Centrosaurine line is quite interesting and demands more study than has so far been afforded to it.