PLATE 2 



EXPLANATION" OF FIGURE 



2 From a reconstruction of a 5 mm. Tragulus embryo. Collection Xo. 

 204. X 100. Showing the symmetrical arrangement of the axial venous channels 

 and the plexuses in connection with them. 1 , aortic arches; 2, pre-cardinal vein; 

 3, dorsal pre-cardinal tributaries; 4, dorsal aorta; 5, post-cardinal vein; 6, um- 

 bilical vein; 7, umbilico-post-cardinal plexus; 8, perimesonephroic plexus, 9, om- 

 phalomesenteric vein; 10, duct of Cuvier. 



224 



