The advice of Mr.Raymond L.Ditmars, Curator of Reptiles in the New York Zoological Park, was sought and we thus obtained the fourth pose, which is shown in the photographs published herewith.
[Illustration: Fig.

15 .-- Model of _Tyrannosaurus_ group for the Cretaceous Dinosaur Hall.] "The fourth pose or study, for the proposed full sized mount, is that of two reptiles of the same size attracted to the same prey.

One reptile is crouching over its prey (which is represented by a portion of a skeleton).

The object of this depressed pose is to bring the perfectly preserved skull and pelvis very near the ground within easy reach of the visiting observer.

The second reptile is advancing, and attains very nearly the full height of the animal.