PLATE III 



EXPLANATION OF FIGURE 



4 Reconstruction (after Born) of veins in the lumbar region of a 29-mm. 

 eat embryo. Lateral aspect, right side, showing the cardinal collateral system 

 of veins (C.C.), which extend, ventral and ventrolateral to the aorta, between the 

 iliac and renal levels. Note the right vena spermatica interim (Pc.2.Dext.) and 

 its relations to the ureter (Ur.) and to the lateral portion of the renal collar 

 (Subc.Sprc.Anast.Dext.). Coll. of P. and S. Embryological Collection, no. 575. 10 



10 College of Physicians and Surgeons of Columbia University. 



62 



