468 



EQLTID.B. 



The three existing genera of this suborder constitute distinct 

 subdivisions of considerably higher rank than ordinary families. 



Fig. 151. — Bones of the maniis of : — fl. Jiorse (Egtms cahallus), h. Ehinoceros 

 {liJiinoccros sumcrtrcm^is), c. Tapir ( Tapiruti mdm/s). II, III, IV, V, second, 

 third, iburtb, and fifth digits. U, ulna; B, radius; c, cuneiform; 

 /, lunar; s, scajihoid; u, unciform; m, magnum; fd, trapezoid; 

 tm, trapezium. (From Flower's 'Osteology of Mammalia.') 



They way, however, for simplicity be classed as of family rank, and 

 living forms may be distinguished thus : — 



Only one digit developed in each foot Equidae. 



Three digits on each foot ; one or two horns on the 



nof=e E-hinocerotidae. 



Foiu" digits on fore feet, three on hind ; no 



horns Tapiridae. 



Family EQUID.^. 

 Genus EaUUS, Linn. (ITGO). 



The characters of the family may, for convenience, be included 

 in the description of the only living genus. In this each foot is 

 formed of a single digit consisting of a metacarj)al or metatarsal 

 and three phalanges, the distal phalanx being surrounded by a 



