A NEW FOSSIL PACHYDERM. 265 



just mentioned, this groove is seen to be double, the external groove 

 being in contact with the alveolar margin ; the interior of these 

 grooves is deeper, and perforates the plate immediately opposite the 

 first premolar. Another fragment containing molars shows a flat- 

 tened surface, rough with longitudinal grooves and elevations 

 towards the side, as if worm-eaten. 



The OS frontis is seen in fig. 4. The posterior contour is round- 

 ed almost in the arc of a circle ; the posterior edge is bevelled off 

 very obliquely, and striate for the adaptation of the ossa parietalia, 

 which have not been obtained. The approximation of the post- 

 orbital processes is remarkable ; they project laterally, having 

 scarcely any tendency downwards ; the superior surface of the 

 bone is much flattened, being scarcely more elevated in the middle 

 than at the sides. 



Fig. 5 represents the parts already described, in their relative 

 position, with the addition of (B) the malar bone and part of the 

 lachrymal. The external surface of these bones is flat, and looks 

 forwards and outwards, but not at all upwards ; the posterior orbi- 

 tal process (a) is very long, acute, and bent inwards at the point ; 

 at d is an indication of a wide, shallow groove ; b is the lachry- 

 mal tubercle, more elevated than in Dicotyles, and placed on the 

 margin of the orbit ; anterior to this the surface looks directly up- 

 wards ; at the base of the lachrymal tubercle is (c) a groove, in 

 which are placed the lachrymal ; anterior to this is (e) a slight con- 

 cavity. In the position of the groove and foramina with reference 

 to the tubercle, a striking difference will be observed between this 

 animal and its allies ; the orbital plate is behind the tubercle, and 

 looks inwards and backwards, the groove and foramina being alto- 

 gether external. In Dicotyles., the orbital plate looks directly back- 

 wards, and the foramina are situated internally. In Tapirus (ac- 



35 



