LUCAS ] 



TRACIiODON ANNECTENS 



319 



Fig. 41. — Series of five teeth of Trachodon, show- 

 ing the new teeth at the bottom, and the old, worn 

 teeth at the top. Somewhat reduced. 



hundred on each side of the lower jaw, so closely packed together 

 as to appear like a mosaic pavement. 



The family of Iguanodons had an extensive geographical range, 

 for their remains have been found in Austria, Belgium, and England ; 

 and in New Jersey, 

 Colorado, Wyoming, 

 Montana, and Alberta, 

 in North America. 

 The first hint of their 

 presence in this coun- 

 try was the discovery 

 of teeth in the Judith 

 River region, Montana, 

 in 1856 ; but not until 

 a partial skeleton was 

 found near Monmouth, 

 New Jersey, was it 

 fully realized that these 

 teeth belonged to some 

 relative of the Euro- 

 pean Iguanodon. The New Jersey specimen was described by 

 Doctor Leidy under the name Hadrosaurus foulkii, and the bones, 



which were deposited in the 

 1 Academy of Natural Sci- 



ences of Philadelphia, fur- 

 nished the basis for a restor- 

 ation of the skeleton by Mr. 

 B. Waterhouse Hawkins. 

 At this time the structure of 

 the dinosaurs was not well 

 known, and Mr. Hawkins, 

 who was not a comparative 

 anatomist, while recognizing 

 the upright position of the 

 animal, restored the missing 

 parts from the skeleton of a 

 modern iguana, the result 

 being the skeleton shown in 

 plate Lxxiii. While this 

 restoration was far from cor- 

 rect, especially in regard to the skull, it was a decided im- 

 provement on that of Iguanodon shown at the Crystal Palace, 



Fig. 42.- — Group of Trachodon teeth (i) 

 seen from the outer side and (2) from above. 

 Much reduced. 



