252 OUTLINES OF EVOLUTIONARY BIOLOGY 



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

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

 photographs.) 



i. l . i. 4 , incisors of upper jaw;i.i i. 3 , incisors of lower jaw; c., canine; p.m.i p.m. 4, 

 prernolars of upper jaw ; p.m.i p.m. 4 , premolars of lower jaw ; m. 1 rn.4, niolai 

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



