. 419 
1872. ] [Cope. 
outer, forms a cingulum-like ledge at its base as far as the angle formed 
by the descent of the apex of the outer crescent. The outline of the 
corner of this tooth, viewed from above, is narrow cordate, with obtuse 
apex. The convexity of the outer crescent inwards is verystrong, and 
the base of the crown is externally two-lobed. Enamel striate rugose 
In amore anterior premolar (with three roots) there is no internal cingu- 
lum, and the crest of the inner crescent is not carried to the external 
basis of the tooth, and is entirely wanting on the posterior face of the 
tooth. The external crescent is more vertical and less concave. Outline 
of crown subtriangular. 
The premaxillary bone is elongate, flat, and with a sloping superior 
face, which rises gently inwards. The bases of the incisors stand obliquely 
outwards. The inferior surface is flat, and the basis of the broken 
palatal spine is rather small. An incisor tooth has a transversely dia- 
mond-shaped crown, slightly twice concave on the inner face, strongly 
convex on the outer, with a faint external cingulum near the external 
angles. Enamel obsoletely striate. 
MEASUREMENTS. | (NO. fa) 
Longitudinal diameter last superior molar 
Transverse = ee 
Longitudinal Te OMIA UO el 6 ano peg see 7 
Transverse ae fe ahacictap chet Wise niaeel gl as .039 
Longitudinal ‘* posterior premolar... 024 
Transverse My ie 3 
Longitudinal “_aaiterior ~ ** 
Transverse ie a He 
Length premaxillary bone.. - 
Transverse width posterior suture.... 
Width premaxillary at middle “‘ ......... : 043 
Length basis last two inferior premolars.......... woe UDG 
Transverse diameter edge of mandible at first premolar .017 . 
Diameter condyles of femur 104 
be heads great trochanter... . 130 
ie Wed B1ONOk 2! aa a ee oe +... 062 
ee shaft with third trochanter O76 
Supposed length femur (16.75) inches 415 
Transverse diameter head of tibia... 
Antero-posterior  ‘“¢ internal... 
oe ep qichwot ie Gian Selene ye ee 
(2) INO <. 
Longitudinal diameter head of humerus.............. 138 
. " of outer cotylus and tuberosity. .055 
The other remains of this animal will be more fully described and the 
whole figured, shortly. They were discovered by Dr. F. V. Hayden, in 
tertiary beds of the Wahsatch Group, near Evanston, Utah. 
