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542 SCIENCE. 
The skull was broken in the exhumation, but 
is nearly perfect; and, when found, a large 
flint chip was found resting against the top of 
the head, as shown in fig. 1, and two others 
resting like epaulets against the shoulders. 
The length of the skull, from the back of the 
v : 
[Vou. IIL, No. 
Although much has been written about these rep- 
tiles since Buckland described Megalosaurus, in 1824, 
but little has been made out in: regard to the struc- 
ture of the skull, and many portions of the skeleton 
still remained to be determined. 
Of the carnivorous dinosaurs from the American 
Skull of Ceratosaurus nasicornis Marsh; top view. a, nasal opening; b, horn-core; c, antorbital 
opening; c’ cerebral hemispheres; d, orbit; e, lower temporal fossa; 7, frontal bone; f, supra-tem- 
poral fossa; j, jugal bone; m, maxillary bone; mm’, medulla; n, nasal bone; oc, occipital condyle; 
ol, olfactory lobes; pf, pre-frontal bone; pm, pre-maxillary bone; g, quadrate bone; q/, quadrato- 
jugal bone. 
head to the forehead, was eighteen centimetres, 
and from the back of the head to the project- 
ing eyebrows, nineteen centimetres and a half: 
the breadth was fourteen centimetres. One 
femur was saved from loss, and measured for- 
ty-nine centimetres in length. 
NEW JURASSIC DINOSAURS. 
In the American journal of science for April, 
Professor Marsh has given the principal characters 
of the Theropoda, a carnivorous order of dinosaurs, 
illustrated by numerous figures, several of which are 
here repeated. 
Jurassic, there are apparently four distinct families, 
one of which is represented by Ceratosaurus, a new 
form here described. ‘The nearly perfect skeleton of 
Ceratosaurus presents several characters not hitherto 
seen in the Dinosauria. One of them is a large horn 
on the skull; another is a new type of vertebra; and 
a third is seen in the pelvis, which has the bones all 
co-ossified, as in all known birds except Archaeopte- 
ryx. Another feature, not before known in carnivo- 
rous dinosaurs, is the presence of osseous dermal 
plates, extending from the skull over the vertebrae. 
This skeleton is over seventeen feet in length. 
The skull of Ceratosaurus is very large in propor- 
tion to the rest of theskeleton. The posterior region 
is elevated, and moderately expanded transversely. 
