n. S. GEOLOGICAL SDRVEY 



MONOGRAPH 55 PLATE CLXVIII 



TYPE SKULL OF BRONTOTHERIUM HATCHERI 

 One-fourth natural size. (See p. 563.) Skull a, type (Nat. Mus. 1216), Big Badlands, S. Dak. (?Corral Draw), Titanotherium 

 zone, level upper B (Hatcher). Vertical crushing may have emphasized the great breadth of this skull, and the horns have 

 been crushed back above the orbits. The thick horns are not much flattened. The supratemporal creils have parallel 

 sides, as in many Brontotheriinae, whereas in the Menodontinae they curve inward in the parietal region. The buccal 

 swellings are almoS as large as in the moil advanced species of the genus 



