46 THE UNIVERSITY SCIENCE BULLETIN. 



Measurements of lower teeth in millimeters. 



Tooth. Height. Length. Width 



Pm, 65 28 13 



Pm, 85 28.5 16.5 



Pm4 88 27 15 



Ml 78 25 18 



M-, 29 15 



M;, 60 30 12.5 



The premolars are curved so as to be slightly convex on the 

 outer face; the first molar is somewhat convex on the inner face 

 and quite strongly convex on the front border. As will be seen 

 from figure 5, the enamel of the premolars is much crinkled; that 

 of the molars somewhat less so. Attention is called to the fact 

 that the length of the grinding face of premolar 2 is not greater 

 than of the next one. 



Both in complication of the enamel and in length and width 

 of the grinding surface these teeth resemble closely the teeth 

 from the region about Charleston, S. C, which have been referred 

 to E. leidyi. 



In size the upper teeth above described agree closely with 

 those forming the type of Equus excelsus Leidy. On close com- 

 parison it is seen that the styles on the outer face of the teeth 

 of E. excelsus stand out more boldly and the intervening channels 

 are deeper and more concave. The enamel of the lakes is far less 

 complicated than in the teeth of the specimens collected by 

 Cragin. That this condition is not due to the greater degree of 

 attrition of the form.er is shown by the fact that some of the 

 teeth of the Cragin collection are still more worn than those of 

 the type of E. excelsus, and they still preserve the deep notches 

 and plication of the enamel. In the type of E. excelsus the pro- 

 tocone is much longer than in most of the teeth referred to E. 

 leidyi. While not too much importance can be attached to this 

 fact, it must be considered. It seems to the writer that the 

 Kansas specimens certainly do not belong to Equus excelsus. 



Besides the equine materials above described, Doctor Cragin 

 found on Spring creek a median metacarpal. This bone has a 

 length of 225 mm. along the outer border. The width at the 

 upper end is 46 mm. ; at the middle of the length, 32 mm. ; across 

 the lower articular surface, 89 mm. The bone is very hard and 

 heavy. It has been, at some stage in its history, much weathered, 

 and it is cracked longitudinally. From the same place is another 

 metacai-pal nearly identical in dimensions but differently fossil- 

 ized. Its length along the outer border is 216 mm.; width at the 

 upper end, 46 mm.; at the middle of the length, 31 mm.; across 



