278 PALEONTOLOGY 



so'ldes occur. In the somewhat later eocene beds at Brackles- 

 ham occur the remains of the gavial-like C. DL'oni. In the 

 Hordle beds have been found the G Hastingsice, with short 

 and broad jaws; and also a true alligator (C. Hantoniensis). 

 It is remarkable that forms of proccelian Crocodilia, now geo- 

 graphically restricted — the gavial to Asia, and the alligator to 

 America — should have been associated with true crocodiles, 

 and represented by species which lived, during nearly the 

 same geological period, in rivers flowing over what now forms 

 the south coast of England. 



Many species of proccelian Crocodilia have been founded 

 on fossils from miocene and pliocene tertiaries. One of these, 

 of the gavial sub-genus (C. crasddens), from the Sewalik 

 tertiary, was of gigantic dimensions. 



Order X. — Lacertilia. 



(Lizards, Monitors, Iguance.) 



('hni\ — Vertebra? proccelian, with a single transverse process 

 on each side, and with single-headed ribs ; sacral verte- 

 brae not exceeding two : two external nostrils ; a foramen 

 parietale in most, 



Small vertebrae of the lacertian type have been found in 

 the Wealden of Sussex. They are more abundant, and axe 

 associated with other characteristic parts of the species, in 

 the cretaceous strata. On such evidence have been based the 

 Rcqjhiosaurus subulidens, the Goniascmrus crassidcns, and the 

 Dolichosaurus longicollis. The last-named species is remark- 

 able I'm' the length and slenderness of its trunk and neck, 

 indicative of a tendency to the ophidian form. But the most 

 remarkable and extreme modification of the lacertian type in 

 the cretaceous period is that manifested by the huge species, 

 of which a cranium five feel long was discovered in the upper 

 * Owen, "History of British Fossil Reptiles," 4to, pp. 173-183, pis. 2, 8, 0. 



