Page "Edmontosaurus" Paragraph 7

The skull of a fully grown Edmontosaurus could be over a meter ( or yard ) long.

One skull of E. annectens ( formerly Anatotitan ) measures long.

The skull was roughly triangular in profile, with no bony cranial crest.

Viewed from above, the front and rear of the skull were expanded, with the broad front forming a duck-bill or spoon-bill shape.

The beak was toothless, and both the upper and lower beaks were extended by keratinous material.

Substantial remains of the keratinous upper beak are known from the " mummy " kept at the Senckenberg Museum.

In this specimen, the preserved nonbony part of the beak extended for at least beyond the bone, projecting down vertically.

The nasal openings of Edmontosaurus were elongate and housed in deep depressions surrounded by distinct bony rims above, behind, and below.

In at least one case ( the Senckenberg specimen ), rarely preserved sclerotic rings were preserved in the eye sockets.

Another rarely seen bone, the stapes ( the reptilian ear bone ), has also been seen in a specimen of Edmontosaurus.