ANT-HILL FOSSIL 



2 39 



which flourished throughout the Mesozoic, but which are here repre- 

 sented in the climax of their evolutionary career. Some were huge- 

 headed forms, armed on the snout and above the eyes with horns like 

 those of cattle and with a wide bony crest which protected the neck. 

 These were quadrupeds of rhinocerine proportions, but of much greater 

 size. Others were bipeds with a long tail which served to balance the 

 body when running on land and was a very efficient propelling organ 

 when stress of circumstance made it necessary to take to the waters for 

 retreat. This second group was armor- and weapon-less, with a curious 

 duck-like expansion of jaws, toothless in front but with a wonderful 

 battery of more than two thousand teeth in the rear of the mouth. Oc- 

 casional mummied carcases have been found which betray the defense- 

 less condition of the scaly skin. Both of these groups were plant feeders, 

 but a third sort, again erect on the hind limbs, bore teeth and claws 

 which can only mean a rapacious flesh-feeder, doubtless the arch-enemy 

 of the other two. These carnivores were represented by small, agile 

 forms, and by others which were truly gigantic. 



The dinosaur remains are pretty widely spread over the present 

 area, the horned skulls generally occurring in hard concretionary 

 masses of sandstone, many of which were collected and shipped to New 



Fig, 3. Massive Sandstone within which the Dinhsaiks are entombed. 



Haven and later to the National Museum in Washington, where the 

 contained fossils were freed from the investing rock. Most of the 



