CARBONIFEROUS PERIOD. 



351 



mentioned on p. 345. It was probably about two and a half feet long ; the body 

 was covered with scales, and the whole surface of the cranium was sculptured. 

 Dawson regards it, therefore, as most nearly related to the Labyrinthodonts. 

 The name is from the Greek 6tv6pov, tree, and tpxerov, reptile. 



Amphibian footprints have been observed in the Coal measures both of Penn- 

 sylvania and Nova Scotia. Near Westmoreland, Pa., in a layer situated about 

 100 feet below the horizon of the Pittsburg coal, Dr. A. T. King counted twenty - 



Fisr. 604. 



Reptiles. — Fig. A, Raniceps Lyellii ; B, Vertebrae and ribs of a Lacertian ; C, Vertebra of 

 Eosaurus Acadianus. 



three consecutive steps of one individual. Those of the hind-feet are five-toed, 

 and of the fore-feet four-toed, — the former five and a half inches long, and the 

 latter four and a half inches. The distance between the successive tracks is 

 six to eight inches, and between the two lines about the same ; which shows 

 that the animal was large, about as long as broad, and probably a Batrachian 

 of the Labyrinthodont tribe. The species is called Thenaropus heterodactylus. 



Lacertians. — Along with the Raniceps were found some of the ribs and ver- 

 tebrae of two other species of Reptiles, one specimen of which is represented 



