220 



STUDY OF PIG EMBRYOS. 



Ao.D. Pul. D.ven. F.s. Au. 



A.is. 



W.b/ 



V.msn 



msth 



W. b." 



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

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

 Ao.D, Descending aorta. Art.v, Arteria vitellina. Au, Auricle. Clo, Cloaca. C<x, Coelom. D.ven, 

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

 Pul, Lung. Seg, Segment. Sotn, Somatopleure. Sp.c, Spinal cord. Uni.w' , Upper wall of umbilicus. 

 Uni.w" , Lower wall of umbilicus. Ve, Vein in liver. Ven, Ventricle of heart. Vil, Villus. V.msn, 

 Vena mesonephrica. V.p, Portal vein. V.s, Valvula sinistra. W.b\ IV.b'', Wolffian body. X 22 

 diams. 



