SEA-SERPENTS 1g! 
four and a half feet. This nearly perfect head was for a time a 
stumbling-block to many naturalists, some of whom were of 
Fic. 67.—Skull of Mosasaurus Hoffmann. The original is 43 ft. by 24 ft. 
opinion that it belonged to a whale. Cuvier and others con- 
sidered it to be a kind of link between 
the Iguanas and the Monitors. 
The entire backbone of the Maestricht 
animal appears to have consisted of one 
hundred and thirty-one vertebre, of which 
ninety-seven belonged to the tail. The 
total length of the skeleton is estimated at 
twenty-four feet, and the head was about 
one-sixth of the total length. The tail is 
only ten feet long, whereas in a crocodile 
Oo 
the tail exceeds the length of the body. #14. 68.—Teeth of Mo- 
sasaurus (% natural size). 
Although in his day the limbs of the 12, 2«, transverse sections 
; - __ of the teeth. 
Mosasaurus were imperfectly known, Cuvier 
1 The Monitors are a family of large lizards inhabiting the warmer parts of 
Africa and Asia, They live near the banks of rivers, and some are altogether 
aquatic. They often devour the eggs of crocodiles and aquatic birds, The 
Nile Monitor, or Varanus, grows to a length of six feet. 
