three cross-crests on the fourth, and four tubercles on the first. Ramus 



deep. 



Measurements. 



M. 



Length of inferior molars 0040 



" second " 0010 



Width " " 0010 



Transverse diameter incisor 0008 



Depth ramus at second molar 0030 



Scarcely larger than the house mouse. 



Perissodactyla. 

 Anchitheritjm cuneatum, sp. nov. 

 Represented by the superior molar teeth of several individuals one- 

 third smaller than those of the A. bairdii. The prominent peculiarity 

 consists in the anterior production of the anterior external cusp anterior- 

 ly, giving a wedge-shaped outline to that part of the tooth. The first 

 premolar is quite small. The fore and aft cingula are well developed, 

 and the basal parts of the transverse ridges are partially separated into 

 tubercles, the posterior one sending a low ridge backwards. 



Measurements. 



M. 



Length of M. 2 and 3 of No. 1 0260 



" M. 1 " 0130 



Width " " 0110 



Length of Ms. 1-4, No. 2 0410 



" M. 2 " 0115 



Width " " 0130 



Artiodactyla. 

 Leptauchenia calcarata, sp. nov. 

 Established on a superior maxillary bone which supports Pm. 3 and 

 4, and M. 1, 2 and 3 in perfect preservation, and probably by other re- 

 mains. 



The species is characterized by the presence of an additional narrow 

 column with acute apex behind the posterior outer crescent. A similar 

 cusp exists in front of the anterior cusp, as in other species. The third 

 premolar is little longer than the fourth, and the inner cusp is very 

 small. 



Measurements. 



M. 



Length of five molars 0.0260 



' ' three true molars 0175 



" last " " 0080 



Width " " " 0070 



This species is smaller than the smallest of the genus yet described. 



