WILLISTON: ADDITIONAL CHAKACTERS OK THE MOSASAURS. 41 



more or less comminuted. A close examination of these remains 

 discloses nothing but fish bones, and usually onl}' those of small 

 size. The largest observed is a vertebra of an Etnpo, or some 

 allied fish, of about four feet in length. 



These remains furnish conclusive evidence that the food of these 

 animals consisted chiefly if not entirely of fishes, and, moreover, 

 fishes of small or moderate size. 



The skin preserved in this specimen does not differ materially 

 from the same membrane in Tylosaunis ; the scales appear to be 

 somewhat larger and the carina is indistinct, though this may be 

 due to the condition of preservation. 



The hyoid bones in this genus resemble those of Tylosaurus 

 (Univ. Geol. Snrv. , Kans., iv, pi. xxi, there wrongly referred to 

 Platccai-piis). 



The presphenoid is well preserved in the skull; it is quite like 

 the same element in Varanies. 



