Chasmosaurus
-described by
Lambe, 1914 (Dodson, 1996). It is known as the "Chasm
lizard". It has enormous fenestrae, reducing half of the
frill to a slender T-shaped framework. The horn cores are
relatively small with only the postorbital horn cores
preserved (Dodson, 1996). The squamosals, according to
Dodson, 1996, "are like long isosceles triangles" that are
very broad at the front and taper back, reaching almost to
the edge of the parietal.
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