16 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 134 
much larger and broader, with a relatively larger and transversely 
flattened talonid cusp. Like P,, this tooth shows a distinct backward 
tilt. P, is larger than P; and has higher cusps, also the talonid shows 
a more pronounced crest on its lingual margin. The backward tilt of 
this tooth is rather pronounced, so that the outer margin of the talonid 
is much lower than that of the trigonid, or than any of the other teeth. 
M, is small and crowded with a comparatively large paraconid por- 
tion, although this part of the tooth is rather obscured by wear. The 
metaconid is developed as an upward and posterolingually directed 
spur from the protoconid. The talonid is low, much worn, and almost 
completely hidden lingually by the anterior root of My. Mz, of course, 
is the shearing tooth and possibly a trifle longer than P,. It lacks any 
trace of a talonid. The posterior blade along its cutting edge is longer 
than the anterior, and projects backward and upward rather strikingly. 
In addition to the backward tilt noted for P; and P,, all the cheek 
teeth, as noted by Matthew (1909), tilt distinctly outward. As with 
the inward tilt of the upper teeth, this orients the shearing surface of 
P; and P,, as well as that of the carnassial, nearly vertical. It is noted 
also that the outer shearing surfaces are dorsoventrally more elongate 
than the lingual walls. The crown of each tooth has a noticeably 
greater buccal than lingual height. 
MEASUREMENTS IN MILLIMETERS OF SKULL AND MANDIBLE OF 
Patriolefis ulta LEIDY, UNIV. UTAH NO. B50 
Skull: 
Greatest length from anterior margin of premaxillae to two 
small processes on superior margin of foramen magnum...... 248. 
Length from anterior margin of nasals to vertical portion of 
Occipit above, fOrdiien MARI. 66S. dads ovelecseesciaesee 227. 
Length from anterior margin of premaxilla to posterior wall of 
glenoid curitee/mediallis ci 2 sei. Ae ee DAVE IN COLO 178. 
Length of palate from anterior margin of premaxilla to anterior 
MARS OPMPOStGhiOL NAviAl APELFEULE.. 4 ajc,0c0.6 6 0:6.5:<0,0.6:0te sia vn are 100.5 
MME CRY, NEGHEUIN ON MS ASAIS Ge Le EMU ih gic Use nih coiaen os legs «oni 78.0 
Distance between lateral margin of anterior narial aperture and 
Gnterion Matear OF OLbil. foc stak eee eek s &E Es. Gilet 52.5 
Crreatest) width across: sy pomiae) 2.256 iss sé ews sies hei enwns 183. 
Waar merce pagals ANtSTION ys. jo wyeiwid oye wibyeisya «dem acd cls mains aera 40. 
Wy tte MEEWEEN “OFPItS GOLSAILY 5 ooo ai. occ 6 susiee cs bveesee ves occa''e 76. 
Width across postorbital processes of the frontals.............. 70. 
Mista of teraniuim ‘at COnsirictione.s 2. le... i vse bese sal eee ee 38. 
Width of palate between canines: 1.2.0. ocd cde ocssclcccs scans Kite 
Width of palate posteriorly, between M?’s at alveoli........... 81 
Upper dentition: 
Over-all length of dentition from anterior surface of lateral 
picisn to posterior tdatein Of Mt... os cscsass od aceccaueesg 105. 
