Taylor: Beavers of Western North America 



449 



+o +o o* o* +0+0+00*0*0*0* 02 



to t-* to i-» i-i |_i h-i t-« O O 



Basilar length of Hensel 



£° 



naxillary tooth-] 

 lar length 



•1 o 



vertical diameter of foramen 

 m to basilar length 



