tip to the highest spot along the crest and that, unlike those in other genera, the nasals meet in the centre and are not separated in front by an ascending premaxillary process. Brown however, mistook the praemaxillae for the nasals; the snout is actually largely formed by them and they do separate the nasals. Brown also thought that on the top and back of the crest, the whole external face is covered by the frontals. Again he made a mistake: what he assumed to be the frontals are in fact the nasals. The nasals end at the back of the squamosals in a hooked, short process. The prefrontals also make up part of the crest; however, Brown mistook the lower upper branch of the praemaxilla for the prefrontal. The actual prefrontal, triangular in shape, is located at the side of the crest base; it was by Brown seen as a part of the frontal. The real frontals, largely internal to the crest base structure, are not visible from the side. The mouth of the holotype of Corythosaurus is narrow. The praemaxillae each form two long folds. The folds enclose air passages extending the narial passages to the front of the snout. There they end in narrow openings, sometimes called "pseudonares", false bony nostrils. These were mistaken by Brown for the real nares or nostrils. These are actually situated inside the crest, above the eye sockets. As in Saurolophus, the expanded portion of the premaxillary in front of the pseudonaris' opening is elongate: by comparison, in Kritosaurus, the bill is short, and the pseudonares extend far forward. At the end of the Corythosaurus bill, the two pseudonares unite into one. Because of his incorrect identification, Brown assumed that the holotype's inferior process of the premaxillary was shorter than in Kritosaurus and Saurolophus, and that the process does not unite with the lacrimal, another difference from those genera. The praemaxilla actually does touch the lacrimal and extends to the rear until well behind the eye socket. The lower jaw of the holotype is long, and deep. The total length of the crest from the beak to the uppermost tip of the type specimen is , its total length is , and height . Soft tissue In the holotype of C. casuarius, the sides and tail of the body are covered in scales of several types. Polygonal tuberculate scales, covered in small bumps,