252 OUTLINES OF EVOLUTIONARY BIOLOGY 



FIG. 108. A, A!, Skull and Mandible of Dog ; B, B t , Skull and Mandible 

 of Thylacine, to .show the arrangement of the teeth, &c. (From 

 photographs.) 



i. 1 . i. 4 , incisors of upper jaw;i.i i. a , incisors of lower jaw; c., canine; p.m. 1 p.m.4, 

 premolars of upper jaw ; p.ra.j p.m. 4) premolars of lower jaw ; m. 1 m.4, molars 

 of upper jaw ; m.j m.^, molars of lower jaw. 



