252 OUTLINES OF EVOLUTIONAKY BIOLOGY 



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

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

 photographs.) 



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

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

 of upper jaw ; m.i m.4, molars of lower jaw. 



