UPPER CHALK FORMATIONS. 



75 



Fig. 143. Ana'nchytes ova'tus. 



Fig. 144. Spa'tangus cor. an guinum. 



17. In the upper part of these deposits we find, among many 

 other fossils, an enormous saurian, called the Mosasaurus (from the 

 name of the river Meuse, and the Greek, sauros, lizard), originally 

 found on the banks of the Meuse, in the celebrated quarries of St. 

 Peter's Mount, near Maastricht (Jig. 145). Organic remains of a 

 Mosasaurus have been found in New Jersey. 



Fig. 145. Head of the Mosasaurus of Maastricht. 



" The Mosasaurus is a genus determined from a fossil discovered upwards 

 of sixty years ago, and which at that time was extremely puzzling to natu- 

 ralists. Its true place in the animal kingdom is now known to be among 

 the Lacertian Saurians; but the animal appears to have been perfectly rna 

 fine in its habits. The head, the only part at first discovered, measured 



7 Where is the Mosasaurus found ? From what is its name derived . 



