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SUPPLEMENT (No. VI) 



TO THE 



MONOGRAPH 



ON 



THE FOSSIL EEPTILIA 



OP 



THE WEALDEN AND PUEBECK FORMATIONS. 



(HYLiEOCHAMPSA.) 



Order— CR OCOD1LIA. 

 Genus — Hyl^eochampsa, Owen. (Plate II of Supplement No. V, figs. 23, 24, 25.) 



The subject of the present ' Supplement ' was discovered by the Rev. W. Fox, M.A., 

 in the Wealden of the south-west coast of the Isle of Wight. It is the hinder part of a 

 skull of a small or young Crocodilian, showing the occipital surface (Plate II, fig. 23), the 

 upper openings of the temporal fossae (ib., fig. 24 t) with the orbits ( ) ; and so much of 

 the palate (ib., fig. 25) as permits of instructive comparisons with that seat of divers 

 modifications in other Reptilia. A few sockets of teeth are shown at the hind end of 

 both right and left maxillary bones. 



These indicate the teeth to have been relatively as large as in Goniopholis; and, 

 although it is hazardous to conjecture the shape of the crown of a Crocodilian tooth from 

 the cylindrical root, as indicated by its socket, yet it seems to me probable that the teeth 

 of the present small Crocodilian resembled more those of Goniopholis 1 than of Sucho- 

 saurus 2 or of Poileilopleuron? 



The outer surface of the cranial bones shows a different pattern of sculpture from that 

 in Goniopholis ; instead of small circular pits there are short irregular ridges, which, at 

 some parts, the postfrontals, for example, have a tendency to diverge from a reticulate 



1 1 Report on British Fossil Reptiles,' 8vo, Part II, 1841, p. 69. 



2 Ib., ib., p. 67. 3 Ib., ib., p. 84. 



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