CARNIVOROUS GROUP. 
35 
dinosaurs were distinguished therefrom by the circumstance that the hone known 
as the pubis (p in the figure on p. 3) enters into the composition of the cavity 
for the reception of the head of the thigh-bone. The limb-bones are solid 
throughout. From the nature of 
their teeth, which are often much 
worn by use, it may be inferred 
that these reptiles were vegetable 
feeders; and it is not improbable 
that they frequented the margins 
of lakes and rivers, where their 
inordinately long necks would 
enable them to browse with ease 
on the various aquatic plants. 
That they must have been very 
sluggish in their movements and 
stupid in their ideas is indicated 
by the wonderfully small propor¬ 
tionate size of their brains. These 
dinosaurs were common both in 
Europe and the United States, the larger forms having been described under the 
names of pelorosaurs ( Pelorosaurus ), atlantosaurs (Atlantosauras), brontosaurs 
(Brontosaurus ), and hoplosaurs (Hoplosaurus) ; among which the atlantosaurs 
appear to have been the most gigantic. They also occur in India, Argentina, 
and Madagascar. 
INNER AND OUTER VIEWS OF A TOOTH OF A PELOROSAUR. 
(From the Quart. Journ. Geol. Soc ., 1S93.) 
BONES OF THE RIGHT HIND- 
FOOT OF A CARNIVOROUS 
DINOSAUR. 
Carnivorous The carnivorous dinosaurs, of which the 
Group. megalosaur ( Megalosaurus ) is the best known 
example, differed from the preceding group in the form of 
their teeth, which were compressed and sickle-shaped, with 
sharp cutting, and frequently serrated edges. Their limb- 
bones also were hollow; while their vertebrae were likewise 
hollow internally, but had no lateral cavities; and the 
pelvis (figured on p. 3), although of the same general 
type as in the lizard-footed group, presented important 
points of distinction. In place of the short feet of the 
last-named group, the carnivorous dinosaurs had elongated 
foot - bones, terminating in sharp claws; the number of 
functional toes in the hind-foot varying from four to three. 
That they habitually walked on the toes of their hind- 
limbs, and not (as was the case with the lizard-footed 
group) on the whole foot, is evident from the structure of 
this part of the skeleton, and from the circumstance that 
the fore-limbs were considerably smaller than the hinder 
pair, it may be inferred that progression was at least 
frequently accomplished by the aid of the latter alone. 
The close approximation of the huckle-bone of the ankle to 
the lower end of the tibia foreshadows the complete 
