9: 
13. 
14. 
15 
16. 
IZ: 
18. 
19. 
19a. 
19. 
20. 
Lacertians. 
PLATE 2. 
Part of the lower jaw of Mosasaurus gracilis, nat. size. 
. Part of the upper jaw of ditto. 
Body of a lumbar vertebra of ditto. 
Body of a dorsal vertebra of ditto. 
Anterior concave surface of the same vertebra. 
A mutilated caudal vertebra of Mosasaurus gracilis. 
. Anterior view of the same vertebra, showing the much expanded hæmal arch: 
the specimen has been drawn upside down in both figures. 
From the Upper Chalk, at Offham-pit, Sussex. In the Collection of Henry 
Catt, Esq., of Brighton. 
Under view of the body of a cervical vertebra of Plesiosaurus constrictus. 
End view of the same vertebra. 
From the Steyning Chalk-pit, Sussex. 
Tooth of a Plesiosaurus. 
From the Scaddlescombe Chalk-pit, near Lewes, Sussex. 
Tooth of a Plesiosaurus. 
10, 11, and 12. Teeth of Mosasauroid Reptiles. From the Sussex Chalk. 
From the Southeram Chalk-pit, Sussex. 
Tooth of a Plesiosaurus. 
From the Southeram Chalk-pit, Sussex. 
Part of the crown of a tooth of a Mosasauroid Reptile, facetted as in Mos. 
Masximiliani. 
Fractured tooth of a Plesiosaurus. 
From the Southeram Chalk-pit, Sussex. 
Tooth of Polyptychodon interruptus. 
Base of the same tooth. 
From the Chalk, near Valmer, Lewes. 
Nine dorsal vertebrae of a Lizard (Coniosaurus crassidens). 
Part of the lower jaw and some attached vertebræ of Coniosaurus crassidens. 
A magnified tooth of ditto, from the front of the series. 
A magnified hinder tooth of ditto. 
View of part of the alveolar groove and teeth of ditto. 
From the Lower Chalk at Clayton, Sussex. In the Collection of Henry Catt 
Esg., of Brighton. 
All the figures are of the natural size. 
