238 



SUPPLEMENT. 



3562. The upper portion of a tooth belonging either to this or an 

 allied form ; from the Wealden of Cuckfield. This speci- 

 men is remarkable for the expansion of the lateral angles 



Pig. 51. 



Pleurocoelus valdensis. — Outer and profile views of a tooth ; 

 from the Wealden of Sussex. \. 



of the crown, which thus assumes a somewhat trefoil-like 

 shape. Mantell Collection. Purchased, 1838. 



3534. The flattened upper portion of a more normally shaped tooth j 

 from Cuckfield. Mantell Collection. 



R. 1616. The imperfect centrum of a dorsal vertebra probably 

 {Fig.) belonging to a somewhat immature individual of this 



Fig. 52. 



Pleurocoelus nanus.— Right lateral and posterior aspects of the centrum of a 

 dorsal vertebra ; from the Potomac beds of North America. \. s, surface 

 for articulation of neural arch ; /, lateral pit ; n, neural canal ; a, anterior 

 ball ; 'p, posterior cup. {After Marsh.) 



form; from the Wealden of Sussex. This specimen, of 

 which the anterior half is wanting, is described and figured 

 by the writer in the ' Quart. Journ. Geol. Soc.' vol. xlvi. 



