120 Development of the Veins in the Limbs of Rabbit Embryos 
In Stage 3, the brachial and femoral veins develop along the inversely 
homologous ulnar and tibial borders. In this case the vein of the arm 
may incorporate the remains of the primitive ulnar vein, as was found to 
oceur in rabbit embryos. The femoral vein on the contrary must be new 
throughout. 
Thus the primitive ulnar and fibular veins, which develop before rota- 
tion, are serially homologous. The veins arising after rotation may be 
considered inversely homologous, the cephalic with the sciatic, zane the 
brachial with the femoral. 
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