352 GEOLOGICAL SUEVEY OF THE TEREITORIES. 



tooth. The external crescent is more vertical and less concave. Out- 

 line of crown subtriangular. 



The premaxillary bone is elongate, flat, and with a sloping superior 

 face, which rises gently inward. The bases of the incisors stand 

 obliquely outward. The inferior surface is flat, and the basis of the 

 broken palatal spine is rather small. An incisor tooth has a trans- 

 versely diamond-shaped crown, slightly twice concave on the inner 

 faces, strongly convex on the outer, with a faint external cingulum near 

 the external angles. Enamel obsoletely striate. 



Measurements. 



No.l. 



Meters. 



Longitudinal diameter last superior molar 035 



Transverse diameter last superior molar 0455 



Longitudinal diameter penultimate molar 032 



Transverse diameter penultimate molar 039 



Longitudinal diameter posterior i)remolar 024 



Transverse diameter posterior premolar 034 



Longitudinal diameter anterior premolar 0215 



Transverse diameter anterior premolar 0265 



Length premaxillary bone 082 



Transverse width posterior suture 028 



Width premaxillary at middle suture 043 



Length basis last two inferior premolars 057 



Transverse diameter edge of mandible at first premolar 017 



Diameter condyles of femur — .104 



Diameter heads great trochanter 130 



Diameter head alone 062 



Diameter shaft with third trochanter 076 



Supposed length femur (16.75 inches) 415 



Transverse diameter head of tibia 092 



Antero-posterior diameter head of tibia, internal .061 



Antero-posterior diameter head of tibia, external .045 



Transverse width between temporal fosses 066 



(?) No. 2. 



Longitudinal diameter head of humerus 138 



Longitudinal diameter of outer cotylus and tuberosity 055 



The other remains of this animal will be more fully described and the 

 whole figured in the final report. They were discovered by Dr. F. V. 

 Hayden in Tertiary beds of the Wahsatch group near Evanston, Utah. 



Bathmodon semicinctus. Cope. 



Log. cit. 



This species differs from the last in several particulars of dentition. 

 The interior ridge (homologous with the inner crescentic) bounding the 

 middle plane of the superior molars, is not continued on the posterior 

 face of the tooth, but curving inward joins the outer crest at its apex. 

 The outer crest terminates in a conic tubercle anteriorly on the external 

 face ; the rudiment of the anterior crescentic ridge appearing as a low 

 ridge from the side of the posterior one, and rising to a point on the an- 



