42 



VERTEBRATA. 



Iguana, whence the name. They are characterized by the prismatic, slightly 

 curved form of the crown, the presence of from two to four longitudinal 

 ridges on the enameled face, and the serrated margins and summit. The teeth 

 of the upper jaw are curved in the opposite direction to those of the lower, 

 and have their convexity external. 



From the Wealden clay of Sussex, England. 

 No. 60. [1393] Iguanodon Mantelli, Meyer. 



Left Hind Foot (cast). 

 The Iguanodon had large 

 hollow limb-bones and un- 

 guiculate feet, the hind 

 pair having only three well 

 developed toes. The small 

 manus had five functional 

 digits. This unique speci- 

 men was found associated 

 with the undoubted leg 

 bones of this great her- 

 bivorous reptile in the 

 Wealden of the Isle of 

 Wight, and has been pro- 

 nounced by Prof. Owen 

 to be the foot, probably hind foot, of a young Iguanodon. Size, 24 x 12. 



No. 61. [191] Brontozoum giganteum, Hitchcock. 



Single Track, on slab 

 (cast). This is the largest 

 tridactyl impression ever 

 discovered, although many 

 thousands of "Bird-tracks" 

 are found in the Triassic 

 rocks, especially in the val- 

 lej' of the Connecticut. It 

 measures eighteen inches in 

 length, embracing an area of 

 thirteen inches square with- 

 in its outlines, and is capable 

 of holding two quarts of 

 water. The print is remark- 

 ably well defined, having 

 all the fidelity of a plaster 

 cast. Most of the so-called 

 bird-tracks of the Trias were 

 certainly made by Dino- 

 saurs, and it is believed that 

 all of them were. This 

 probably belonged to a bi- 

 pedal Dinosaur that lived 

 by the shore of an estuary 

 which deposited the Triassic 



