702 THE BRIDGEE FAUNA. 



I have various specimens referable to a species of the size of this one, 

 but the only one which displays the entire superior dental series is a part 

 of a skull from the bad lands of Cottonwood Creek, Wyoming (Plate L, 

 figs. 1, 2). It agrees in its measurements with some of the specimens de- 

 scribed by Dr. Leidy under the name of Paloeosyops paludosus. A second 

 specimen (Plate L, fig. 3), from the Washakie Basin, is intermediate in 

 dimensions between the latter and the P. major. I have not seen the 

 second superior premolai-. On this account, and on account of its dimen- 

 sions, I cannot be • sure of its specific position, but describe it under the 

 present head. Should the skull above mentioned prove to belong to the 

 P. paludosus Leidy, and the other specimen belong to another species, the 

 latter may bear the name under which it has been and is now described. 



In the cranium the prominent features are the elongate nasal bones, 

 and the deeply excavated external nares. The former are well preserved, 

 they are of equal width throughout, and have a flat superior surface and 

 strongly decurved nareal bordei's. Their distal exti'emities are subtrun- 

 cate, each bone slightly rounded. The nareal border is above the anterior 

 part of the second premolar. The posterior ascending branch of the pre- 

 maxillary bone disappears from the nareal border above the middle of the 

 canine tooth, or .030 M. anterior to the posterior nareal border. The face 

 between the nares and orbit is flat; below its middle the large infraorbital 

 foramen interrupts the surface. The surface at the canine alveolus is very 

 prominent, standing out much beyond the surface at the premolar teeth. 

 The malar ridge projects immediately from the border of the infraorbital 

 foramen. It is very prominent below the orbit, presenting a horizontal 

 surface downwards. Its external surface slopes obliquely inwards to the 

 border of the orbit. The anterior border of the latter is over the postei'ior 

 third of the first true molar. The malar bone presents a postorbital angle 

 upwards. It is much expanded downwards posteriorly, and gives the in- 

 ferior border of the zygoma a decurved outline. The superior border of the 

 squamosal process rises strongly posteriorly. The premaxillary bones are 

 not prominent, and their anterior extremities are transverse and not coossi- 

 fied. The infraorbital foramen issues above the posterior part of the fourth 

 premolar. The molars have the general form of those of P. major, but the 



