522 MAMMALIA. 



e^. Horns generally large ; the navicular and cuboid ele- 

 ments of the tarsus usually distinct ; canines only 

 moderately developed. . . Cervus, p. 1 74. 



, e^. Horns absent ; canines very large. 



Moschus, p. i;i. 



c^. Horns absent ; 3rd and 4th metacarpals unite late or not 

 at all ; 2nd and 5th digits complete on each foot ; canines 

 present in both jaws ; placenta diffuse. 



Tragulus, p. 188, 



IP'. Non-ruminant hornless forms with tarsals and carpals, ulna 

 and fibula distinct and complete ; manus and pes tetradac- 

 tyle ; incisors present in upper jaw, molars with tubercu- 

 late or transversely ridged crowns ; canines present in both 

 jaws ; stomach simple ; placentation diffuse. 



[=Bunodontia.] 



Sus, p. 192. 



a^. Digits of the pes odd in number ; median or 3rd digit symme- 

 trical bilaterally; femur with a 3rd trochanter; tympanic 

 bone small and solid ; stomach simple, caecum long ; no 

 gall bladder ; placentation diffuse ; horns when present un- 

 paired. [=Perissodactyla.] 



e. Forms with soft hairy skin ; nose proboscidiform ; 

 radius and ulna, tibia and fibula complete, the two 

 latter distinct ; manus with four, pes with three digits. 



Tapirus, p. 198. 



e^. Forms with thick skin and scanty hair; radius and 

 ulna, tibia and fibula complete ; manus and pes tri- 

 dactyle ; orbits incomplete ; canines absent ; one or 

 two coreless epidermic mesial horns on the snout 

 formed of fused hair. . Rhinoceros, p. 201. 



e^. Specialized forms; ulna and fibula incomplete dis- 

 tally, confluent proximally with the radius and 

 tibia ; 3rd digit on each foot functional only, the 

 2nd and 4th rudimentary and represented by splint 

 bones; orbits complete. . . Equus, p. 198. 



Key of the Genera of Indian BovidcB. 



a. Horns always present in both sexes, and set wide apart ; occi- 

 pital and frontal planes form an acute angle ; muffle large; 

 no antorbital pits ;■ four mammce ; large and massive animals. 



Bos, p 123. 



