220 



STUDY OF PIG EMBRYOS. 

 G- Ao.D. Pnl. D.vtn. V.s. A„. 



\r.b.' 



V.t 



in si '/i 



W. b." 



Fig. 130.— Pig, 9.0 mm. Sagittal Series 53, Section 213. 

 A, Entodermal cavity (probably gall-bladder). AM, Intersegmental artery. All, Allantois. Ao, Median aorta 

 Ao.D, Descending aorta. Art.v, Arteria vitellina. Au, Auricle. Clo, Cloaca. Ca, Crelom D vm 

 Ductus venosus. Ent, Entoderm. G, Ganglion. Glo, Glomerulus. Li, Liver, msth, Mesothelium' 

 Pi,/. Lung. Seg, Segment. So,,,, Somatopleure. Sp.c, Spinal cord. Um.w', Upper wall of umbilicus 

 Um.w ', Lower wall of umbilicus. I'; Vein in liver. Ven, Ventricle of heart. Vil, Villus V.msn 

 Vena mesonephrica. /:/, Portal vein. V.s, Valvula sinistra. II'J.', IS'.!,", Wolffian body ^22 

 diams. 



