U. S. GEOLOGICAL SURVEY 



MONOGRAPH 65 PLATE LI 



SKULLS OF TELMATHERIUM ULTIMUM AND MANTEOCERAS MANTEOCERAS 



A, Telmatherium ultimum, type (Am. Mus. 2060), Uinta Basin, Utah, level Uinta C. B, Manteoceras manteoceras (Am. Mus. 2353), south of Hayilack 



Mountain, Washakie Basin, Wyo., level Washakie A(7), canines and incisors partly reilored from Am. Mus. 1566. Both one-third natural sise 



