HOFFMEISTER & MOHR: ILLINOIS MAMMALS 



43 



3. Feet each with only 1 hoof Order PERI S SOD ACT YLA ; horse 

 Feet each with 2 hoofs 



Order ARTIODACTYLA ; deer, cattle, etc. 



4. 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 MARSUPI ALI A ; opossum 



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

 not prehensile, terminal half not white 5 



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. 40c, d, 41 6 



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 INSECTI VORA ; shrews and moles 



Canine teeth absent, fig. 40c, 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 



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



behind each large upper incisor, fig. 40d 



Order LAGOMORPHA ; rabbits 



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

 mediately behind the upper incisors 



Order RODENTIA; rodents 



Skulls 



1. Upper jaw without incisors 



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



Upper jaw with incisors 2 



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



