Williston.] Mosasaurs. 91 



Mainosauvus Dollo. 



Upper Senonian of Belgium ( brown phosphatic chalk of 

 Cipley) . 



PLATECARPIN^E. 



Platecarpus Cope. 



Upper Turonian of Kansas and Colorado ( Niobrara) . 

 ? Senonian of Mississippi. 



Plioplateearpus Dollo. 



Lower Maestrichtian of Belgium ( Danian) . 



Prognathosaurus Dollo. 



Upper Senonian of Belgium (brown phosphate of Cipley). 



? Brachyscturus Williston. 



Senonian of Dakota (Fort Pierre). 



Sironectes Cope, and Holosaurus Marsh. 



Upper Turonian of Kansas ( Niobrara) . 



Taniwhasaurus Hector. 



Upper Cenomanian of New Zealand. 



MOSASA URINJE. 

 Mosasa urus Conybeare. 



Lower Danian of Belgium and England (Upper and Lower 



Maestrichtian and Upper Chalk ) . 

 Upper Senonian of Belgium (brown phosphate of Cipley). 

 Senonian of New Jersey and Dakota ( Greensand and Fort 



Pierre) . 

 ? Senonian of Alabama and North Carolina. 



Clidastes Cope. 



Uppermost Turonian or lowermost Senonian of Kansas and 



Colorado ( Niobrara and Fort Pierre) . 

 Senonian of New Jersey, Alabama, and Mississippi. 



INCEPTS SEDIS. 



Paptosaurus Marsh. 



Upper Senonian of New Jersey (Upper Greensand ) . 

 Upper Turonian of Kansas ( Niobrara) . 



Phosphorosaurus Dollo. 



Upper Senonian of Belgium ( brown phosphatic chalk of 

 Cipley) . 



