.■)44 KICIIARD SWANN LULL ON 



tail prohiiljly was nut haljitual, but occurred ouly wlien the animal \va.s slowing down 

 before stopping. 



Another abundant genus is Grallator characterized Ijy very long limbs and small, 

 compact feet without an impressing hallux and with no tail trace. The proportions of 

 length of limbs to those of feet are the same as in the bustards and the forms which made 

 the tracks were probably aberrant carnivores of habits somewhat similar to those of wad- 

 ing birds, possibly feeding upon feebler reptiles and amphibians, or on fish. In consider- 

 ing the probable relationship of this genus to genera known from their skeletal remains 

 one is reminded strongly of Ornithomimus. a Cretaceous Compsognathoid dinosaur. 

 Grallator comprises for the most part, small forms, the smallest species, G. ijniciris, 

 indicating a creature l)ut two thirds the size of Conipsognathus. the smallest known dino- 

 saur, whose dimensions may be compared with those of the ilomestic cat. 



Among the habitually bipedal forms, those which never impress the mauus, is one 

 group to which the name Eubrontes has been given. It includes larger and heavier forms 

 than Anchisauripus with more l)lunted claws, but Hitchcock included it with the latter 

 under the name Eubrontes and the later name Brontozoum. The two genera are so 

 different in character that the present author is constrained not only to separate them gen- 

 erically but ordinally as w^ell. for the lack of a grasping hallu.x;, the heavy, slow moving- 

 tread, and the blunter claws are surely not carnivorous characteristics, but seem to point 

 rather to an herbivorous habit of life. It may be that instead of being Orthopod or Pre- 

 dentate dinosaurs the Eulu'ontes represent another group of aberrant Carnivora, which 

 like the condor {Sarcor/Kiiujihiis (/ri/phit.s) because of carrion feeding habits, did not retain 

 the raptorial claws of its predacious allies. The genus Eubrontes wdiile few as to species 

 contains some of the most impressive forms which are fairly numerous as to individuals. 

 Eubrontes gif/anteiis represents an animal of massive proportions and of about twenty feet 

 in length, which is nearly the maximum for American Triassic dinosaurs, though much 

 inferior in size to those of the Jurassic and Cretaceous periods. Dinosaurs beyond question 

 herbivorous in their habits and hence belonging to the order Orthopoda, are the occasion- 

 ally quadrupedal forms which, though walking on the hind feet, placed the fore feet on 

 the ground while sitting. This shows that on both manus and pes the claws are short and 

 rounded and no longer subserve a grasping function. The particular interest which 

 attaches to this fact is that it is the first evidence we have of Orthopoda or Predentate 

 dinosaurs in the Trias, for their skeletal remains are entirely unknown either in this 

 country or in pAU'ope from the rocks of that period. 



Anomoepus, the most characteristic genus among the herbivorous forms, had a peuta- 

 dactyl manus with rounded claws and a tetradactyl pes with somew^hat longer, but still 

 blunted claws. The hallu.x was but half rotated and therefore ill fitted for grasping and 



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