"4 EXTINCT MONSTERS. 
creature was more aquatic than terrestrial in its habits. Plaster 
casts of the limb-bones may be seen at the British Museum of 
Natural History, side by side with the huge Atlantosaurus cast 
sent by Professor Marsh. 
The Kimmeridge clay of Weymouth has yielded a huge arm- 
bone (or humerus), nearly five feet long ; and from Wealden strata 
of Sussex and the Isle of Wight vertebree have been collected. 
Altogether we have remains of Cetiosaurus from at least half a 
dozen counties. Unfortunately, no specimen of a skull has yet 
been found, and only two or three small and incomplete teeth, 
which may possibly have belonged to some other animal. Pro- 
fessor Owen estimated the length of the trunk and tail of the 
creature to have been thirty-five or thirty-six feet; but in the 
absence of further evidence it was not possible to form any con- 
clusion as to its total length. It is evident that Cetiosaurus was 
closely allied to the American Brontosaurus (p. 69); and so these 
earlier English discoveries have gained much in interest from the 
light thrown upon them by Professor Marsh’s huge Saurian. 
Another English Saurian of this group was the Ornithopsis, 
from Wealden strata in the Isle of Wight, which has been the sub- 
ject of careful study by Mr. Hulke and Professor Seeley. Their 
conclusions, based on the examination of separate portions of the 
skeleton (such as vertebrae), have been singularly confirmed by 
the discovery of Brontosaurus. 
In Ornithopsis the vertebree of the neck and back, though of 
great size, were remarkably light, and yet of great strength. One 
of the vertebrze of the back had a body, or centrum, ten inches 
long. Hoplosaurus and Pelosaurus were evidently reptiles closely 
allied to the above types; but at present are so imperfectly known 
that we need not consider them here. 
