d its total
length, including the tail, being estimated at from forty to
fifty feet. As the head of the thigh-bone is set on nearly at
right angles with the shaft, whilst all the long bones of the
skeleton are hollowed out internally for the reception of the
marrow, there can be no doubt as to the terrestrial habits of
the animal. The skull (fig. 180) was of large size, four or five
feet in length, and the jaws were armed with a series of powerful
pointed teeth. The teeth are conical in shape, but are strongly
compressed towards their summits, their lateral edges being finely
serrated. In their form and their saw-like edges, they resemble
the teeth of the "Sabre-toothed Tiger" (_Machairodus_), and they
render it certain that the Megalosaur was in the highest degree
destructive and carnivorous in its habits. So far as is known, the
skin was not furnished with any armour of scales or bony plates;
and the fore-limbs are so disproportionately small as compared
with the hind-limbs, that this huge Reptile--like the equally
huge Iguanodon--may be conjectured to have commonly supported
itself on its hind-legs only.

The _Cetiosaur_ attained dimensions even greater than those of
the Megalosaur, one of the largest thigh-bones measuring over
five feet in length and a foot in diameter in the middle, and
the total length of the animal being probably not less than fifty
feet. It was originally regarded as a gigantic Crocodile, but
it has been shown to be a true Deinosaur. Having obtained a
magnificent series of remains of this reptile, Professor Phillips
has been able to determine many very interesting points as to
the anatomy and habits of this colossal animal, the total length
of which he estimates as being probably not less than sixty or
seventy feet. As to its mode of life, this accomplished writer
remarks:--

"Probably when 'standing at ease' not less than ten feet in height,
and of a bulk in proportion, this creature was unmatched in magnitude
and physical strength by any of the largest inhabitants of the
Mesozoic land or sea. Did it live in the sea, in fresh waters,
or on the land? This question cannot be answered, as in the case
of Ichthyosaurus, by appeal to the accompanying organic remains;
for some of the bones lie in marine deposits, others in situations
marked by estuarine conditions, and, out of the Oxfordshire district,
in Sussex, in fluviatile accumulations. Was it fitted to live
exclusively in water? Such an ide