Classification of the Binosauria. 83 



(1) Family Stegosauridce. Vertebrae biconcave. Neural canal in 

 sacrum expanded into large chamber ; ischia directed backward, with, 

 sides meeting on median line. Astragalus coossified with, tibia ; 

 metapodials very short. 



Genera Stegosaurus (SypsirJiopJius) , Diracodon, and in Europe, 

 Omosaiirns, Owen. 



(2) Family Scelidosauridoe. Astragalus not coossified with tibia ; 

 metatarsals elongated ; four functional digits in pes. Known forms 

 all European. 



Genera Scelidosaurus, AcantJiopholis, Cratceomus, Hylceosaurus, 

 Polacanthus. 



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



Feet digitigrade, five functional digits in manus and three in pes. 

 Pubes projecting free in front ; post-pubis present. Vertebrse solid. 

 Fore limbs small ; limb bones hollow. Premaxillaries edentulous in 

 front. 



(1) FaniWj Camptonotidce. Clavicles wanting; post-pubis complete. 

 Genera Camptonotus, Laosaurus, Nanosaurus, and in Europe Hyj)- 



silophodon. 



(2) Family Iguanodonfidcg. Clavicles present ; post-pubis incom- 

 plete. Premaxillaries edentulous. Known forms all European. 



Genei'a Iguanodon, Vectisaurus. 



(3) Family HadrosauridcB. Teeth in several rows, forming with 

 use a tessellated grinding surface. Anterior vertebrae opisthocoelian. 



Genera Madrosaurus, ? Agathaumas, Cionodon. 



(4.) Order Theropod A. (Beast foot). Carnivorous. 



Feet digitigrade ; digits with prehensile claws. Pubes projecting 

 downward, and coossified distally. Vertebree more or less cavernous. 

 Fore limbs very small ; limb bones hollow. Premaxillaries with 

 teeth. 



(1) Family Megalosauridm. Vertebra biconcave. Pubes slender, 

 and united distally. Astragalus with ascending process. Five 

 digits in manus and four in pes. 



Genera Megalosaurus (Poikilopleiiron) , from Europe. AUosaurus, 

 Coelosaurus, Greosaurus, Dryptosaiirus {JLcdaps). 



(2) Family ZanclodontidcB. Vertebrae biconcave. Pubes broad 

 elongate plates, with anterior margins united. Astragalus without 

 ascending process ; five digits in manus and pes. Known forms 

 European. 



Genera Zanclodon, ? Teratosaurus. 



(3) Family AmpMsauridcs. Vertebrae biconcave. Pubes rod- 

 like ; five digits in manus and three in pes. 



Genera Amphisaurus {Megadactylus), ? Bathygnathus, ? Clepsy- 

 saurus ; and in Europe, Palceosaurus, Thecodontosaurus. 



(4) Family Labrosauridcs. Anterior vertebrae strongly opistho- 

 coelian, and cavernous. Metatarsals much elongated. Pubes slender, 

 with anterior margins united. 



Genus Labrosaurus. 



