CHANGES IN FETAL VESSELS OF THE LIVER 



507 



Fig. 18 Proximal portion of the degenerating umbilical vein from a kitten 

 fourteen days old. With higher magnification the original lumen is clearly 

 recognizable, n, remnant of original vein; b, connective tissue wall. X142. 



Fig. 19 Transverse section of the free caudal border of the suspensory 

 ligament of a cat about six weeks old. It contains no recognizable remnant of 

 the umbilical vein, is quite vascular and composed of very loose fibrous connec- 

 tive tissue bounded by peritoneum. X97. 



i'ig. 20 Transverse section of the peripheral portion of what seemed to be a 

 r()un<l ligament in a kitten seven days old. There is no trace of the umbilical 

 vein in tlic vcrv fibroiis conne<'tive tissue. X142. 



