1916] 



Taylor: Beavers of Western North America 



445 



tf 3 



O &J 



3 B 



W O 



o*+o+o .o +o o* o* 2 



Mastoid width 



Sf Interorbital 



(See fig. C) 



Width of nasals 



g P" to h to h p » o Maxillary tooth-row 



r+ bo c^ c© to o c-s m 

 W g, 



oq to to M m m M w Most dorsal point on outline of 



e+ £ ^ P ? . M ? J° ? foramen mapnm to occipital crest 



2 oioo-joeo'-'-Jon median line. (See fig. li ) 



5 



r 1 rf, ^ £1 ^ ^ to " ^ Vertical diameter of foramen 



to bo to bo to w ^ bi magnum. (See fig. E) 



o 



S S « S o S » 5 Transverse width of 



of •*. Ui bo *. ^ bo ct. foramen magnum 



•c 



Q 



ro m to to k h ^ to Ratio vertical diameter of foramen 



S boocncotoo'rf* magnum to basilar length 



tO- 

 « coSn M !» »o Ratio maxillary tooth-row 



•"■ w io io » « ^ m t0 basilar len et h 



o bo o o bo bo bo Ratio width of nasals 



h b to h m b ci l0 basilar length 



