386 BULLETIN UNITED STATES GEOLOGICAL SURVEY. \Yol.n. 



Measurements. 



M. 



Length of skull from inion to above Pm. II 048 



Length from inion to base of postorhital process (axial) 032 



"Width of skull at glenoid cavities 020 



Width of skull behind bases of postorhital processes 009 



Vertical diameter of orbit - - 0125 



Depth of skull and mandible in place, at middle of orbit 0310 



Depth of mandible at condyle -..=. 0310 



Length of mandible to exit of incisor 044 



Depth of mandible at last molar Oil 



Depth of mandible at middle of diastema 005 



Length of superior molar series 012 



Width of Pm. 11 (above) 002 



Width of M. I 003 



Length of inferior molar series 013 



Length of inferior Pm. Ill 003 



A fragmentary skeleton is associated with jaws and teeth of this spe- 

 cieSy and they are presumably parts of the same animal. They resemble 

 the corresponding parts of Lepus sylvaticus, but are relatively smaller. 

 The centrum of a lumbar vertebra is much depressed. There is a prom- 

 inent anterior inferior spine of the ilium. On the internal side of the 

 distal end of the tibia the ligamentous groove is more, and its bound- 

 ing proxjess is less, disttuct than in L. sylvatieus. 



Measurements. 



M. 



Width of centrum of lumbar vertebra 0083 



Depth of centrum of lumbar vertebra 0040 



Diameter of acetabulum G06O 



TV. , i. 1 J J? J.-1,- (anteroposterior Oil 



Diameters of head of tibia < ^^ „, „, 



^transverse 0105 



T^. , J. J- . T J ^ ^-v (anteroposterior 0046 



Diameter of distal end of tibia < ^^ „„„ 



( transverse 009 



Length of free part of calcaneum .007 



From the John Day Eiver and the north fork of the John Day Eiver^ 

 Oregon. C. H. Sternberg. 



This rabbit is the oldest species which can be referred to the genus 

 Lepus. It is dedicated to my friend Prof. Jacob Ennis, of Philadelphia, 

 the distinguished mathematician and physicist. 



