This page has been validated.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/0/03/PSM_V53_D224_The_great_cretaceus_ocean.jpg/500px-PSM_V53_D224_The_great_cretaceus_ocean.jpg)
The Great Cretaceous Ocean. Drawn by J. Carter Beard.
Mossaurs; 1, Platecarpus coryphœus (Cope); 2, Tylosaurus Proriger (Cope); 6, Mosasauris Horridus (Williston); all restored by Williston. 3, Marine turtle: Protostega gigas (Cope), restored by Case. 4, Bulldog fish: Portheus Molossus (Cope). 5, Pterosaur: Pteranodon, or Ornithostoma ingens (Marsh), restored by Williston. 7, Plesiosaur: Plotycotylus latipinnis, as restored by Dames.