The Quarterly journal of the Geological Society of London (12736385365)

AND PELVIC BONES OF PLTOSAURUS EVANSI.

717

bone is deeply concave from side to side, nearly flat from within

outward, with the articular surface directed outward and downward

so as to meet the inferior external surface in a rounded border. Its

antero-posterior extent in the middle is 1^ inch, but becomes less

laterally. The line in which it joins the atlas is concave, but is in

a vertical plane.

On each side the wedge bone terminates superiorly in a flattened

triangular surface, to which were attached the bases of the neural-

arch elements. The neural-arch bones are not preserved. Each

had a broad union with the atlas, which widens laterally (b, fig. 2)

from

files from the biodiversity heritage library the quarterly journal of the geological society of london 1877 geology high resolution

1877

Biodiversity Heritage Library

http://commons.wikimedia.org/

public domain