PLATE XXXVII 



EXPLANATION OF FIGURE 



52 Keconstruction (after Born) of veins in the lumbar region of a 45-nim. cat 

 embryo. Lateral aspect, left side. Type C (left supracardinal vein). Note 

 elongated left side of renal collar (Subc.Sprc.Anast.), which forms a segment 

 of the vena cava; also, opening of V. spermatica interna (Pc.) into cava at 

 caudal end of renal collar (Subc.Sprc.Anast.). Princeton Embryological Collec- 

 tion, no. 14. 



130 



