PLATE XXXII 



EXPLANATION OF FIGURES 



44 Eeconstruction (after Born) of veins in the lumbar region of a 17-mm. 

 cat embryo. Lateral aspect, right side. Princeton Embryological Collection, 

 no. 36. 



45 Eeconstruction (after Born) of veins in the lumbar region of a 17-mm. cat 

 embryo. Lateral aspect, left side. Periureteric venous ring, through which ureter 

 passes, present on the left side. In its present transition stage, the vena cava 

 posterior is represented by Type BCD (right and left supracardinal, and left 

 posterior cardinal veins). Princeton Embryological Collection, no. 36. 



120 



