BIG BADLANDS OF SOUTH DAKOTA. 475 



suggesting that this tooth was not only single-rooted, but fairly 

 large, the alveolus measuring 20 mm. antero-posteriorly. P2 is a 

 good-sized tooth (see table of measurements), separated from pi by 

 an 18 mm. interval and from p3 by a space of 8 mm. 



4. The size and shape of the mental processes. These are rather 

 small for such a large skull. The anterior process has a convex 

 rugose surface, roughly elliptical to oval in outline, 40 mm. long by 

 23 wide, separated from the body of the ramus by a narrower neck 

 14 mm. wide in front, but thinning out to an edge behind and curv- 

 ing downward and outward. The posterior process is a low conical 

 outgrowth, broad at the base, with blunt tip, and curving downward, 

 outward and finally upward. 



Measurements. 



Type of A. Type of A. 

 ■wanlessi scoUi 



No. I2S22. No. 10885. 



Skull length, condyles to incisor border 562 mm. 672 



Width across muzzle at alveolus of p2 87 



Width of rami of lower jaws back of anterior mental 



tubercles 69 66 



Anterior mental tubercles, lateral extent 92-5 I57+ 



Posterior mental tubercles, lateral extent 163.5 227 



Length of malar process below orbit 152.5 260 



Width of process at narrowest point 70 88 



Greatest width distally 80 115 



Length of anterior process of temporal from glenoid 



cavity 82 



Length of symphysis 125 173 



Depth of jaw below pi 73 81 



Depth of jaw below m3 85 116 



Upper premolar length I44 ^76 



Lower premolar length 151 192 



Lower molar length 91.S 107 



Diameter, upper canine at base of enamel, antero-posteriorly 29 

 Diameter, lower canine at base of enamel, antero-posteriorly 28 



Diameter pi, antero-posteriorly 24 25 



Diameter p4, antero-posteriorly 24 30 



Diameter mi, antero-posteriorly 32 Z^-S 



Diameter pi, antero-posteriorly, alveolus only 20 28 



Diameter p2, antero-posteriorly 28.5 36+ 



Diameter p3, antero-posteriorly 39-5 52 



Diameter p4^ antero-posteriorly 34-5 39 



Diameter ml, antero-posteriorly 30 32.5 



Diameter m2, antero-posteriorly 22 35 



Diameter mj, antero-posteriorly 28 39 



