TAPIR. 



605 



depression divides at the base of the anterior and outer demi- 

 cone and the posterior division is continued into the interspace 

 of the two demi-cones ; these, therefore, now become the outer 

 ends of the two transverse wedge-shaped eminences, giving their 

 summits a curve whose concavity is turned backwards : the last molar 

 may be known by the shorter and more curved posterior eminence. 



In the lower jaw the double transverse-ridged type of tooth, 

 which has been before described in the Kangaroo, Diprotodon and 

 Manatee, prevails throughout the molar series (PL 96, fig. 5) : the 

 teeth are narrower in proportion to their antero-posterior extent 

 than in the upper jaw, especially the first premolar, in which the 

 anterior basal talon is developed in a conical lobe, connected by a 

 longitudinal ridge with the outer part of the first transverse eminence. 

 This ridge is narrower than the posterior one, which has both its 

 angles bent forw^ards, and the outer one produced as far as the 

 anterior eminence. The two transverse eminences become more 

 equal in the succeeding teeth ; the angles of each are, as it were, 

 slightly folded forwards and inwards, making the fore-part of each 

 eminence concave : the anterior basal ridge decreases in breadth, 

 and the posterior one, which is obsolete in the first and second 

 premolars, gradually increases in the others, but is not developed 

 into a third lobe or eminence in the last molar, nor is relatively 

 so large in any of the molars as in the corresponding teeth of the 

 Manatee. There is a small eminence at the outer part of the 

 valley between the two transverse ridges, but no connecting ridge 

 crossing the middle of the valley as in the Kangaroos ; the transverse 

 eminences are thicker and less elevated than in the Diprotodon and 

 Notothere, but are higher than in the Manatee. From the relative 

 position of the teeth in fig. 4, it will be seen that the corresponding 

 tooth of the first premolar above is wanting in the lower jaw, and 

 that the first there answers to the second lower premolar in the 

 Palseothere. The upper molar teeth, with the exception of the first, 

 are implanted by four fangs; the lower molars by two, which are 

 more divergent than in the Manatee. 



221. Succession. — The number of deciduous molars is f^*: the 

 first above is relatively broader anteriorly than the premolar which 

 succeeds it : the rest resemble the true molars of the permanent 



