436 



University of California Publications. [Geolocy 



Specific Characters. — Small size of teeth. Molar columns 

 triangular rather than approximately circular in cross-section. 



Description. — This species is referred to the genus Palac- 

 dlagus because P :! consists of one main column with a groove on 

 its external face and the other premolars and molars are made 

 up of two columns in anteroposterior relation. 



P :i is nearest that of P. Jiaydeni, but the groove is further 

 back. The molars of this specimen differ also in that the columns 

 are irregularly triangular in cross-section with the apex cut off 

 where they meet, instead of the perfectly regular cylindrical 

 columns of P. haydeni. Its small size also easily distinguishes it 

 as a different species. 



Measurements. 



No. 12.V75 



P 3 , anteroposterior diameter 09 mm. 



P :J , transverse diameter 1.4 



P 4 , anteroposterior diameter 1.5 



P 4 , transverse diameter 1.7 



M„ anteroposterior diameter 1.5 



Mj, transverse diameter 1.8 



M., anteroposterior diameter 1.8 



M 2 , transverse diameter 1.8 



LEPUS VETUS, n. sp. 

 Fig. 20. 



Type no. 12565, Univ. Calif. Col. Vert. Palae., portion of 

 a left ramus of the lower jaw with incisor, P :i , P 4 , M 1; M 2 , the 

 posterior portion broken off behind M 3 . Cotype no. 11571, a 

 portion of a right ramus of the lower jaw with a complete molar 

 series. No. 12565 is from locality no. 1100 at Thousand Creek, 

 Humboldt County, Nevada. No. 11571 is from locality no. 1065 

 at Virgin Valley, Humboldt County, Nevada. 



Specific Characters. — Small size of jaw in proportion to size 

 of teeth and length of tooth row. Incisor small in proportion to 

 jaw. 



General Description. — The molar teeth of this species present 

 a close resemblance in size and pattern to those of Lepus campes- 

 tris townsendi, but the incisor is much smaller, the diastema 

 shorter, and the whole ramus is smaller and slighter. 



