400 CHORDATA. 
The front-limb of the rabbit shows a primitive condition 
by the presence of a distinct centrale in the wrist, but the 
hind-limb is specialised in the loss of fibula and first digit. 
The third trochanter, however, appears to be an archaic 
character. 
Fig. 291.—DorsaL VIEW OF LErr Pes or THE RasBiIT. (Ad zat.) 
(Slightly magnified. ) 
Terminal 
Phalanx. 
end Phalanx. 
ist Phalanx. 
SHUR Internal 
: Cuneiform. 
Navicular. me : Middle 
Cuneiform. 
External 
Astragalus. zs 
2 Cuneiform. 
Calcaneum. 
Development.—The rabbit is like nearly all mammals, viviparous. 
Its period of gestation is thirty days and several young are produced at 
a birth. The placenta is discotdal and dectduate. (For details of 
mammalian development see Chapter XX VI.) 
