394 



Professor Buckland on the Mescalosaurus. 



In the same quarries at Cuckfield, he has discovered also the remains of 

 birds, being, with the exception of Stonesfield, the only instance of the kind 

 that I know of in strata beneath the chalk. 



He has also established many other remarkable analogies between the ani- 

 mal remains of the Tilgate Forest beds, and those of Stonesfield, which may 

 be most briefly stated in the subjoined tabular form : 



Fossil Remains of Stonefield Slate. 



Birds. 



Megalosaurus. 



Plesiosaurus. 



Crocodile scales, teeth, and bones. 



Whale, humerus and ribs. 



Tortoise scales. 



Sharks' teeth, many varieties with 

 striated surfaces, all differing from 

 those in chalk, of which the sur- 

 faces are smooth. 



Spines of balistes. 



Palates of sea wolf and other fishes. 



Scales, teeth and bones of fishes. 



Fossil wood. 



Ferns and reeds. 



Small leaves converted to coal. 



Quartz pebbles, rarely. 



Fossil Remains of Iron Sand of Tilgate Forest. 



Birds. 



Megalosaurus. 



Plesiosaurus. 



Crocodile scales, teeth, and bones. 



Whale, humerus, ribs, and vertebrae. 



Tortoise scales and bones. 



Sharks' teeth, many varieties with stri- 

 ated surfaces, all differing from those 

 in chalk, of which the surfaces are 

 smooth. 



Spines of balistes. 



Palates of sea wolf and other fishes. 



Scales, teeth and bones of fishes. 



Fossil wood. 



Ferns and reeds. 



Small leaves converted to coal. 



Quartz pebbles, rarely. 



The above analogies are very striking; and though they show that the con- 

 dition of the earth was nearly the same at the time when both these forma- 

 tions were deposited, yet the numerous and thick strata of oolite interposed 

 between the two, forbid us, even for a moment, to suspect their identity. The 

 same conclusion also follows from a considerable variation between their fossil 

 plants, and from an almost total discrepancy between their fossil shells. 



In a future communication, I propose to give a description with plates of 

 the other most remarkable remains that occur at Stonesfield. My present 

 object is to confine myself to the megalosaurus ; and as we are yet in posses- 

 sion only of dislocated fragments of this animal, the best method I can adopt 

 is to subjoin the following description, imperfect as it is, of the plates annexed 

 to this notice. 



Head. — No part of the head of the megalosaurus has yet been discovered. 



