THE SKULL OF REPTILES 



57 



Very great also, are the modifications of the palate. The anterior 

 nares are situated either between the prevomers and the maxillae, 



Fig. 46. Sauropterygian skulls: A, Peloneustes. After Linder. One 



ninth natural size. B, Plesiosaurus. After Andrews. One sixth 



natural size. C, Muraenosaurus. After Andrews. One sixth 

 natural size. 



Fig. 47. Sauropterygian skulls: A, Nothosaurus, from above. One fourth natural size. 

 B, Simosaurus, from below. After Jaekel. One fourth natural size. C, Thaumatosaurus, 

 from below. After Fraas. One fourth natural size. 



