82 GUIDE TO THE FOSSIL MAMMALS AND BIRDS. 



Fig 77 -Lower jaws of American Jurassic Mammals, from Wyommg 

 USA • A B twice nat. size; C-F, thiice nat. size; G four times 

 nat." size. 'Named by 0. C. Marsh as foUows :- a. Docorfon striatzis; 

 B. Dicrocynodon victor; c. Priacodon ferox ; d. D^-yolestes priscm, 

 E Drvolestes vcrrax ; F. Asthcnodoii segms ; G. Laodo7i ^^f S 

 a, canine; b, condyle; c, coronoid process; d, angle; g, mylohjoid 

 groove ; s, symphysial surface. 



