Prof. 0. C. Marsh — Classification of Dinosaurs. 399 



digits ; pollex spine-like. Sternal bones ossified. Postpubis in- 

 complete. Femur longer than tibia. (Figure 11.) 



Genera Iguanodon, Vectisaurns. Jurassic and Cretaceous. Known 

 forms all European. 



Fig. 11. — Iguanodon Bernissartensis, Boulenger. -£$. Cretaceous, Belgium. 



(9) Family Tracliodontidce (Hadvosauridce). Premaxillaries eden- 

 tulous ; teeth in several rows, forming with use a tessellated grinding 

 surface. Cervical vertebras opisthoccelian. Limb bones hollow ; 

 fore limbs small ; femur longer than tibia. 



Fig. 12. — Claosaurus annectens, Marsh. -g%. Cretaceous, Wyoming. 



Genera Trachodon (Hadrosaurus, Diclonius), Cionodon. Creta- 

 ceous, North America. 



