119 
THE DEVELOPMENT OF THE UROGENITAL SYSTEM. 
But this condition is well 
groups of the lower vertebrates. 
enough adapted to the general ends to be attained at this pe- 
L Subclavian. omit 
Left Carotid, © 
Art. Innom. 
Vena Cava Descend, ----- 
Pulmonary Art. 
-- Left Auricle. 
Left Auric.- Vent. 
in 
Foramen Ovale, .....--..f----:; 
Eustachian Valve, .......\-£ & 
Opening. 
Right Auric.-V ent. Opening. ........ a 
Hepatie Vein. — 
Branches of the 
Aorta ra 
DW PPIPP.DQLD PND) 
Umbilical Vein, ..., 
to the Liver. 
~ Duetus Venosus. 
lacs. 
Dy 
Wena. Cava™Ascenden, 
Internal Iliac Arteries. 
Fic. 188.—Diagram of the foetal circulation (Flint). 
