602 



B 



Fig 464 —Diagrams to show the development of the arterial arches in Amphibia. 

 From Goodrich, Studies on the Structure and Development of Vertebrates, 1930- 

 Macmillan, London. 



A, Larval urodele ; B, adult urodele ; C, adult anuran. Left side view. Vessels carrying mostly arterial 

 blood, white ; venous blood, black ; mixed blood, stippled. 



a 1- Primary arterial arches ; ca, conus arteriosus ; cb, carotid body ; cc, common carotid ; ^.carotid duct; 

 'da, median dorsal aorta ; db, ductus Botalli ; dc, left ductus Cuvien ; .c externa! caro id -eg blood 

 vessels of external gill ; ic, internal carotid ; la, left auricle ; Ida, lateral dorsal aorta ; Ig, lung o^A, 

 ophthalmic ; or, orbital ; pa, puhnonary artery ; pea, pulmocutaneous arch ; pv pulmonary yem 

 s, closed spiracle ; sa, systemic ; sv, sinus venosus ; tra, truncus arteriosus ; v, ventricle ; vci, inferior 

 caval vein. 



