 A set of characters were indicated by Barnum Brown in 1914 to distinguish Corythosaurus from all other hadrosaurids from Alberta : a comparatively short skull with a high helmet @-@ like crest formed by the nasals , prefrontals and frontals ; the nasals not being separated in front by the premaxillaries ; a narrow beak , with an expansion in front of an elongated naris ; and a small narial opening . 
 A set of characters <a href='uninflect' title='1'><mark>were</mark></a> indicated by Barnum Brown in 1914 to distinguish Corythosaurus from all other hadrosaurids from Alberta : a comparatively short skull with a high helmet @-@ like crest formed by the nasals , prefrontals and frontals ; the nasals not being separated in <a href='negative_concord' title='2'><mark>front</mark></a> by the premaxillaries ; a narrow beak , with an expansion in front of an elongated naris ; and a small narial opening . 
A set of characters was indicated by Barnum Brown in 1914 to distinguish Corythosaurus from all other hadrosaurids from Alberta : a comparatively short skull with a high helmet @-@ like crest formed by the nasals , prefrontals and frontals ; the nasals not being separated in no front by the premaxillaries ; a narrow beak , with an expansion in front of an elongated naris ; and a small narial opening .