THE REIGN OF REPTILES. 



183 



that the Rhynchosaurus of the Trias was a three-toed bi- 

 pedal reptile, as was also the Ramphorhynchus of the Ju- 

 rassic (Fig. 74) ; and some three-toed bipedal tracks of the 

 Wealden have also been referred to reptiles. Professor 

 Cope, of Philadelphia, the most accomplished herpetologist 

 of our country, has very recently enunciated the conviction 



Fig. 73. Ichnolites, or tracks on stone. 

 [A slab of sandstone (eight feet by six) from Turner's Falls, Massachusetts im- 

 pressed with numerous footprints of bipeds, possibly birds. The tracks 'indi- 

 cate ten or twelve individuals of various sizes. Discovered by Dr. James De-\ue 

 of Greenfield, Massachusetts, 1843.] 



