82 Prof. O. C. Marsh on the Dinosauria. 



Genera : SceUdosauruH^ AcanthophoUs, Cratceomus^ Hylceo- 

 saurus, Polacanthus. 



(3.) Order Ornithopoda (Bird- foot). Herbivorous. 



Feet digitigrade, five functional digits in manus, and tliree 

 in pes. Pubes projecting free in front; postpubis present. 

 Vertebrte solid. Fore limbs small • limb-bones hollow. Pre- 

 maxillaries edentulous in front. 



(1.) YanvXj Campto7iotidce. Clavicles wanting ; postpubis 

 complete. 



Genera : Camjjfonofus, LaosauruSj Natiosaurus, and in 

 Europe Hi/psiloj-thodon. 



(2.) Family Iguanodoniidce. Clavicles present ; postpubis 

 incomplete. Premaxillaries edentulous. Known forms all 

 European. 



Genera : Ljuanodon, Vectisaiirus . 



(3.) Family Iladrosauridce. ''J'eeth in several rows, forming 

 with use a tessellated grinding surface. Anterior vertebrae 

 opisthoccelian. 



Genera : Hadrosaurus^ ? Agathaiimas^ Cionodon. 



(4.) Order Tiieropoda (Beast-foot). Carnivorous. 



Feet digitigrade; digits with prehensile claws. Pubes 

 projecting downward, and coossified distally. Vertebra more 

 or less cavernous. Fore limbs very small ; limb-bones hollow. 

 Premaxillaries with teeth, 



(1.) Family Megalosaiiridce. Vertebras biconcave. Pubes 

 slender, and united distally. Astragalus with ascending pro- 

 cess. Five digits in manus, and four in pes. 



Genera : Megalosaurus [Po{kilo2)Ieuron) , from Europe ; Allo- 

 sauriiSj CoelosauniSj Creosaurus, Dryptosaurus (Lcelaps). 



(2.) Family Zanclodontidce. Vertebrce biconcave. Pubes 

 broad elongate plates, with anterior margins united. Astra- 

 galus Avithout ascending process ; five digits in manus and 

 pes. Known forms European. 



Genera : Zanclodon, ? Teratosaurus. 



(3.) Family Amphisauridce. Vertebras biconcave. Pubes 

 rodlike ; five digits in manus, and three in pes. 



Genera: Amj^hisauriis {Megadactylus)^ '^BathijgnathuSj 

 ? ClepsysauruSj and in Europe Palceosaurus^ Thecodonto- 

 saurus. 



(4.) Family Lahrosauridcv. Anterior vertebras strongly 

 opistliocoelian and cavernous. Metatarsals much elongated. 

 Pubes slender, with anterior margins united. 



Genus Lahrosaurus. 



