264 



PALAEONTOLOGY 



strata and Purbeek limestone. Some of these fossils indicate 

 a reptile of at least 30 feet in length. 



Genus Hyl.-eosauru.s, Mtll. — Remains of the Dinosanrian 

 so called have hitherto been found only in Wealden strata, as 

 at Tilgate, Bolney, and Battle. The must instructive evidence 

 is that which was exposed by the quarreymen of the Wealden 

 stone at Tilgate, and was obtained and described by Mantel] 

 in 1832. It consisted of a block of stone measuring 4£ feet 

 by '2h feet (fig. 76), and included the following parts of the 



Fig. 70. 

 HijUcosau rv.s ( Wealden ) . 



skeleton in almost natural juxtaposition : — io, anterior verte- 

 brae, the first supporting part of the base of the skull ; several 

 ribs, 4, 4 ; some enormous dermal bony spines, 5, 6, 6, which 

 supported a strong defensive crest along the back ; two cora- 

 coids, 7, 7; scapulas, 8,8; and some detached vertebrae and 

 fragments of bones. In 1841 the writer showed that the 

 sacrum was dinosaurian, and included five vertebrae. 



The teeth are relatively small, close-set, thecodont in im- 

 plantation, with subcylindrical fang and a subcompressed 

 slightly expanded and incurved crown, with the borders 

 straight and converging to the blunt apex. They indicate 

 rather a mixed or vegetable diet than a carnivorous one. The 



