Journ. of Morph., Vol. XTV. Fi. 
A ; 
Fic. 15. — Arterial system of embryo II. 4, fourth dorsal segmental artery; /’., vertebral 
P., pulmonary; S., subclavian; C., coeliac axis. 
Fic. 16. — Arterial system of embryo XLITII. 
Schmidt and Mall del. 
