PLATE 9 



EXPLANATION OF FIGURE 



10 Reconstruction showing the axial veins and lymphatics in a 23 mm. 

 Tragulus embryo. Collection No. 228. X 100. 2, pre-cardinal vein; 23, arch 

 of aorta; 25, jugular lymph sac; 26, dorso-lateral process of the lymph sac; 28, 

 azygos segment of thoracic duct; 29, post-azygos segment of thoracic duct; 

 31, caudal division of the pre-azygos segment of the thoracic duct; 32, sympa- 

 thetic nerve; 33, vagus nerve; 35, jugular vein; 51, azygos vein; 62, dorsal seg- 

 mental vein; 65, sub-hepatic portion of post-cava. 



238 



