386 THE AMERICAN NATURALIST [ Vol. LII 



about the size of the modern turkey, described and figured 

 by Hoernes as Compsognathus longipes Wagn. (Fig. 3) 

 from the lithographic slate of Kelhemi, exhibits an un- 

 usually well-developed opisthotonos, the skull lying far 

 back over the pelvis. 



Probably the most complete representation of opis- 

 thotonos among fossil vertebrates is that seen in the skele- 

 ton of the small cursorial dinosaur, Struthiomimus alius 



