296 



PETRIFACTIONS AND THEIR TEACHINGS. CHAP. III. 



The proximal articular surface is nearly flat ; the distal end 

 that unites with the first phalangeal is a bold trochlear 

 articulation. 



LIGN. 63. BONES OF THE FEET OF THE IGUANODON, AND MEGALOSAURUS. 

 ( Wealden. Tilgate Forest. ) 



Fig. 1. Metatarsal of Iguanodon : upper surface ; original six inches long. 



2. Metacarpal bone of Megalosaurus. 



3. Under surface of fig. 1. 



4. A metacarpal bone of the Maidstone Iguanodon; the original 14 in. long. 

 4a. A transverse section of the same, showing the medullary cavity. 



5. One of the first or second phalangeal bones of the fore-foot. 



6. View from above of a claw-bone of one of the hind-toes; -J- nat. size. 



7. Profile of claw-bone of fore-foot: -J- nat. size. 



8. Metatarsal, nat . size. 



a. Denotes the proximal articulation. 



b. The distal extremity. 



Phalangeals. The first phalangeals that articulate with 

 the metatarsals are less arched, and the extremities are more 

 equal, than in the preceding bones. 



The second and third phalangeals are more subcylindrical ; 

 the ungual phalanx exceeds the length of the latter, in the 

 only connected series I have met with. 



In the Maidstone specimen there are several metatarsals, 

 phalangeals, and unguals of the hind-feet, of which I shall 

 treat more particularly. But I would here direct attention 



