HOFFMEISTER b MOHR: ILLINOIS MAMMALS 



43 



5. 



6. 



7. 



Feet each with only 1 hoof. .Order PERISSODACTYLA ; horse 



Feet each with 2 hoofs 



Order ARTIODACTYLA ; deer, cattle, etc. 



Inner toe of each hind foot thumblike, fig. 40a, widely sep- 

 arated from the other toes; tail long, nearly naked, pre- 

 hensile, terminal half white 



Order MARSUPIALIA ; opossum 



Inner toes of hind feet not thumblike; tail haired or naked, 

 not prehensile, terminal half not white 5 



Canine teeth decidedly longer than adjacent teeth, fig. 117 



Order CARNI VORA ; flesh eaters 



Canine teeth either much smaller than incisor teeth or ab- 

 sent, figs. 40<:, d, M 6 



Canine teeth small, fig. 41 ; distance between teeth not 

 greater than length of a single grinding tooth; eyes and 



ears either minute or absent: snout long, figs. 45-49 



Order INSECTIVORA ; shrews and moles 



Canine teeth absent, fig. 40f, d\ gap between incisors and 

 grinding teeth equal to or greater than length of entire 

 row of grinding teeth; eyes, and usually ears, conspicu- 

 ous ; snout not greatly elongate 7 



Tail a cotton-like tuft; a small peglike tooth immediately 



behind each large upper incisor, fig. 40^ 



Order LAGOMORPHA ; rabbits 



Tail elongate, not a cotton-like tuft; no peglike teeth im- 

 mediately behind the upper incisors 



Order RODENTI A ; rodents 



Skulls 



Upper jaw without incisors 



Order ARTIODACTYLA (in part) ; cattle, deer, etc. 



Upper jaw with incisors 2 



Fig. 41. — Skull of eastern mole, side view. 



