SUPPLEMENT (No. VIII) 



TO THE 



MONOGRAPH 



ON 



THE FOSSIL EEPTILIA 



OP 



THE WEALDEN AND PURBECK FORMATIONS, 



(GONIOPHOLIS, PETROSUCHUS, and SUCHOSAURUS.) 



Order. CROCODILIA. 



Genus — Goniopholis, Owen} 



Species — Goniopholis crassidens? Plates I — IV. 



The knowledge of this remarkably well-defended Amphiccelian Crocodile has been 

 chiefly derived from a study of the specimen now in the British Museum, obtained in 

 1837 by Robert Trotter, Esq., E.G.S., from a quarry of Purbeck stone in the vicinity 

 of Swanage. 3 Confirmation and additional characters of the genus have been afforded 

 by more fragmentary remains obtained by Mantell from the Wealden of Tilgate, and 

 by G. B. Holmes, Esq., from the Wealden of Cuckfield and the vicinity of Horsham. 



The first indication of the genus was given by detached teeth, one of which is figured in 

 Plate I, fig. 3, from the Tilgate quarry, and which presented a more robust form of crown 

 than that of Suchosaurus and other Crocodilia, then known, of that formation ; the propor- 

 tions being rather those of the teeth of the proccelian broad -faced Crocodiles 4 and Alligators 5 



1 'Report of the British Association,' "On British Fossil Reptiles," Part II, 1841, p. 69. 



2 lb., ib., p. 69. 



3 A reduced view of this group of parts of the same skeleton is given in Mantell's ' Wonders of 

 Geology,' vol. i, pi. i, 3rd edit., 1839. The quarry belongs to the ' Limestone Series' of the ' Middle Purbeck.' 



4 Cuvier, ' Ossemens Fossiles,' 4to, tome v, part ii, pi. i, figs. 4 and 5. 



5 lb., Ib., figs. 6, 7, 8. 



8 



