42 THE UNIVERSITY SCIENCE BULLETIN. 



terior lobe, the other on the hinder lobe. The two meet at the 

 place of union of the two lobes, making an angle of about 135°. 

 This tooth appears to resemble closely the third upper tooth of 

 G. M. Allen's Mylodon garmani (Mem. Mus. Comp. Zool., vol. 

 XL, pi. 2, fig. 3) rather more than that represented by Cope 

 (op. cit.) ; but the latter tooth was not complete, and was pretty 

 certainly incorrectly restored. 



The first lower tooth is here shown from behind (pi. I, fig. 5) 

 to illustrate its curvature, and in section (pi. III, fig. 4). The 

 height in a straight line is 90 mm. The anteroposterior diameter 

 is 23 mm.; the transverse 16 mm. The groove along the inner 

 face is deeper than in the section given by Cope. Of this tooth 

 in Mylodon garmani, Allen says that the inner side is nearly flat. 

 As in the tooth just referred to, there are two planes of wear, an 

 anterior and a posterior. 



Hipparion cragini, new species. 



In the collection made by Doctor Cragin there is an upper 

 molar or premolar which seems to belong to a hitherto undescribed 

 species. Accompanying the specimen is a note made by Doctor 

 Cragin which reads as follows: 



"Upper part of Bluff Cr., Clark Co., east of Minneola (Thomas 

 ranch), in Pleistocene deposits bearing Elephas columhi and Equus 

 curvidens. Can this have been derived from the Loup Fork? 

 Latter occurs, but further east." 



It is, of course, possible that the tooth was originally left in 

 deposits preceding the Pleistocene. However, it presents no signs 

 of being water-worn, rolled or weathered. It is stained just as are 

 teeth of Equus from the same beds. 



It is not yet certain that species of Hipparion continued on into 

 the Pleistocene; but there are some indications that they did. A 

 tooth of Hipparion, referred by the writer with doubt to Neohip- 

 parion gratum (Geol. Surv. Iowa, vol. XXIII, pi. IX, figs. 1, 2), 

 was found in what is supposed to be Aftonian gravels, at Rock- 

 port, Mo. Other remains were discovered in Aftonian gravels 

 near Thayer, Iowa. The occurrence of the tooth here described 

 in Pleistocene deposits in Kansas supports the view that the genus 

 did not become extinct at the close of the Tertiary. 



The crown (pi. I, figs. 6, 7) has now a height of 38 mm. on the 

 outer face. The length of the grinding surface is 17 mm.; the 

 width, 17 mm. The protocone has a fore-and-aft diameter of 6.5 

 mm. At a distance of 25 mm. above the grinding surface the fore- 



