16 



Dinosauria Ancliisauridce, etc. 



Teratosau- 

 ;rus. 



, Meg-alosau- 

 : rus. 



Table-case, 

 No. 14. 



Wall-case, 

 No. 4. 



i Drypto- 



| saurus. 



aiegalosau- 

 rus. 



Wall-case, 

 No. 7. 



Numerous other fine Dinosaurian remains are to be seen in 

 the collection, but as we do not know the teeth of many of these 

 huge reptiles, we cannot speak positively as to their habits. It 

 is certain, however, that, from the Trias to the Chalk, two groups 

 have existed, one having a carnivorous dentition, and the other 

 being herbivorous. Teratosaurus of the Trias of Stuttgart, 

 Cerato saurus and Allosaurus of the American Jurassic rooks, 

 Megalosaurus and Compsognathus of the Oolitic and Wealden 

 strata were all carnivores. 



The actual counterpart and casts of the maxilla and 

 premaxilla and a portion of the ramus of the lower jaw 

 of Megalosaurus from the Inferior Oolite, Sherborne, Dorset, 

 may be seen in the Wall- case. Of Polacanthus, Omosaurus, 

 and Hylceosaurus, we have no direct dental evidence, but 

 judging from a comparison of the other portions of their 

 skeletons, they have been referred to the family of the 

 Stegosauridce. No doubt, as amongst the Mammalia at the 

 present day, the majority were vegetable- feeders, and the 

 minority were predaceous in habit. The Cretaceous genus 

 Dryptosaurus, and the Jurassic Ceratosaurus and Allosaurus 

 were, in America, the representatives of the carnivorous 

 Megalosaurus of our Secondary rocks. 



Many species of Dryptosaurus have been identified, and a 

 series of plaster-casts of bones of Dryptosaurus aquilunguis are 

 exhibited in the case. 



ANCHISATJRIDJE. The genus Anchisaurus has amphicoelous 

 cervical vertebroB, the pubis is rod-like, there are five digits in 

 the manus and pes. The teeth are without serrations on the 

 anterior border. Epicampodon (Fig. 18, A, B, c) is an allied 

 genus from India. 



FIG. 18. Fragment of mandible, A, lateral aspect; B, posterior aspect ; C section of 

 tooth of Epicanipodon indicus (Huxley i, from the Panchet beds (U. Trias), Lower 

 Gondwanas of Bengal ; fl, lateral aspect of tooth of Tltecodcntotawit* ptatyodo* 

 (Biley & Stutchbury), Upper Trias, Bristol. 



