NOTES ON A NEW FOSSIL MAMMAL. 7 



three transverse rows at rig'lit angles to it. The ename] is extra- 

 ordinarily thick, aij(l the dentine which occupies the centre of the 

 column appears as a I'ound section on the niasticatirjg surface. The 

 hase of the teetli is narnnv, compressed and 2-rooted in all cases. 

 The pidp cavitv is almost wanting" in the crown, only extending 

 as a small I'ounded canal in each tubercle for a very short 

 distance. Alth(3ugh we could not examine anv other premolars 

 than the last ])remolar in the upper jaw, yet it is almost certain 

 that there must have existed another premolar located anteriorly, 

 judging from the well worn surface of the lower premolar 

 corresponding to it. 



Firü prcuioldr : The premolars of the lower jaw are tW'O in 

 number. The crown in the tirst premolar (PI. III. tig. 1 a & b) has 

 a, longer axis of o.^'™, a shorter axis of 2'"', and a height of about 

 2.7'"'. It is composed of seven pillars, which are not so distinctly 

 separated into two symmetrical halves as is seen in the succeeding 

 teeth. These pillars are very close together so that there is no space 

 left between them. So when seen from above, the pillars are not 

 circular in section, but appear strongly compressed tow^ard one 

 another. The masticating surface is comparativelv little worn, so 

 that the dentine is not much exposed on it. The posterior side of 

 the tooth presents neatly titting faces to the second premolar, but on 

 the anterior side we can not tind any face Avhich might have come in 

 c<jntact with another tootii. 



Second jyn'iiiolar : The second premolar of the lower jaw (PI. III. 

 tio-, 2 a & b, tii»-. o a & b) has a lono-er axis of 4.7™' and a 

 shorter axis of o.2'"", while the height of the crown is reduced to 

 2,5'"'. as the result ot much friction. It is divisible into tW'O lonofi- 

 tudinal halves and three transverse j)arts. Each of these parts 

 consists of a column-like tubercle with the thick outer enamel and the 



