Knight working under the writer's direction. One is drawn in the
conventional bipedal or standing posture while the other is in a
quadrupedal pose or walking position, sustaining or balancing the fore
part of the body on a muddy surface with its fore feet. In the distant
water a large number of animals are disporting themselves.
"The designation of these animals as the 'duck-billed' dinosaurs in
reference to the broadening of the beak, has long been considered in
connection with the theory of aquatic habitat. The conversion of the
fore limb into a sort of paddle, as evidenced by the Sternberg
specimen, strengthens this theory.
"This truly wonderful specimen, therefore, nearly doubles our previous
insight into the habits and life of a very remarkable group of
reptiles."
_Saurolophus, Corythosaurus._ In the latest Cretaceous formation, the
Lance or Triceratops beds, all the duck-billed dinosaurs are much
alike, and are referred to the single genus _Trachodon_. In somewhat
older formations of the Cretacic period there were several different
kinds. _Saurolophus_ has a high bony spine rising from the top of the
skull; in _Corythosaurus_ there is a thin high crest like the crown of
a cassowary on top of the skull, and the muzzle is short and small
giving a very peculiar aspect to the head. Complete skeletons of these
two genera are exhibited in the Dinosaur Hall; the _Corythosaurus_ is
worthy of careful study, as the skin of the body, hind limbs and tail,
the ossified tendons, and even the impressions of the muscular tissues
in parts of the body and tail, are more or less clearly indicated.
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