PLATE 17 



EXPLAXATION OF FIGURE 



28 From same reconstruction as fijjuro 27. View from left side. 



I, aorta 



3, dorsal aortic roots 

 3, aortic arch VI 



7, carotid artery 



8, dorsal somatic arteries 



.9, superior mesenteric artery 

 10, precardinal (jugular) vein 



II, subclavian vein 



12, duct of Cuvier 



13, vertebral vein 



15, jugular lymph sac 



15a, thoracic duct 'approach' of jugular 

 lymph sac 



16, groups of developing blood cells 



17, thoracic duct 



18, lympathics along aortic arches 



19, lymphatics dorsal to aortic roots 

 and arches 



20, lymphatics dorso-lateral to aorta 

 £1, mesenteric lymphatics 



£2, lymphatics associated with esoph- 

 agus 



196 



