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S. W. WILLISTON 



there can be little doubt. The extremely hollow bones also 

 suggest arboricolous habits. Why the creature had such elon- 

 gated cervicals I do not see. At one time the idea was enter- 

 tained that Araeoscelis possessed more or less of a Flughaut, because 

 of the development of the outer fingers and the possible loss of 



Fig. 8. — Araeoscelis gracilis Williston: Life restoration, about one-fourth natural 



size. 



the first. And the cervical vertebrae certainly suggest those 

 of the pterodactyls or birds, as Seeley has suggested of Protoro- 

 saurus. The presence of similar cervical vertebrae and hollow 

 bones suggests somewhat similar habits for both these reptiles, 

 but the vertebrae of Protorosaurus are clearly more like those of 

 the crawling lizards, while those of Araeoscelis resemble more those 



