Z PROCEEDINGS OF THE NATIONAL MUSEUM, vol. 61. 



molar only a part of the outer front one is present, the bone in front 

 of it being gone. The total length of the tooth line was close to 

 85 mm. The first molar appears to have had its transverse axis 

 turned so as to make an angle of about 45° with the tooth line, 

 the inner end being turned backward so that the inner root is op- 

 posite the front and outer root of the second molar. From the outer 

 border of the outer and hinder socket to the inner border of the 

 inner socket is a distance of 22 mm. The roots of the second molar 

 are present in their sockets. Evidently this tooth and the succeed- 

 ing one were in the jaw when it was exhumed. This second molar 

 has three roots, as the other molars, two outer ones and one inner. 

 The distance across its outer sockets is 19 mm., that across the outer 

 sockets of the third molar is 22 mm. ; and this seems to have been 

 the length of the crown of this tooth. The tooth appears to have 

 had a width of about 25 mm. The roots of the hinder molar are 

 large. The outer anterior is wholly hidden. The outer hinder root 

 sent its extremity through the bone at a distance of 31 mm. from its 

 base (pi. 1, fig. 2). The inner root is exposed nearly its whole length 

 on the inner face of the bone (pi. 1, lig. 1). It has a length of 

 40 mm. and a diameter of about 13 mm. at its base. 



The crown of the hinder molar has lost a little of its enamel in a 

 few places; but the loss has not seriously injured it. Its length is 

 26.5 mm.; its width, 25 mm. It had only just begun to suffer wear. 

 It presents essentially the characters of the genus Metaxytherium, 

 as these have been expressed by Abel.- Figure 4 of plate 1 repre- 

 sents the tooth with the cones restored so as to show their positions. 



The enamel of the tooth is strongely wrinkled. Running across 

 the tooth about the middle of the length is a deep valley. Its course 

 is not direct, but from the outer side it runs slightly forward in 

 front of the metaconule and then swerves slightl}- backward as it 

 passes to the inner side of the tooth. The valley is most widely open 

 near its outer end, but it is narrowed at its immediate entrance by 

 a little accessory conule attached to the base of the metacone. On 

 the other hand, there are no accessory conules to block up the inner 

 end of the valley, such as Abel has represented in his figure 17 on 

 his page 149. The protocone, the protoconule, and the para cone 

 stand in a straight transverse row. The paracone and the proto- 

 conule are very close to each other. The former is somewhat larger 

 than the latter. The summit of the protocone is worn dov\"n and 

 the probable shallow notch between it and the protoconule has been 

 effaced. There is a large anterior talon; and, on the outer half of 

 the crown, this is separated from the paracone and the protoconule 

 by a wide and deep valley. The outer half of the talon is narrow 



»Abel, Abb. Geol. Rcicbsanst., Wien, vol. 19, Heft. 2, pp. 148-151. 



