236 



STUDY OF PIG EMBRYOS. 



layer of mesenchyma. The two together constitute the anlage of the peritoneal 

 covering of the organ. To the median side of the Wolffian body is appended the 

 large anlage of the genital gland, Gen, which has a constricted connection with 

 the Wolffian body. Each gland is covered by mesothelium and extends until 



Nch. 



ec.gl. 



R.sy 



Ao. 



art. 



tit si h. -i-i; 



IV.D. In. Li. vist. 



Fig. 137. — Pig, 17.0 mm. Transverse Series 51, Section 651. 

 Ao, Dorsal aorta, art. Glomerular artery. Cce, Ccelom. ec.gl, Ectoglia. G, Ganglion. Gen, Genital 

 gland. Glo, Glomerulus of Wolffian body. In, Intestine. Li, Liver, mam. Mammary anlage. mst. 

 Mesentery, msth, Mesothelium. N, Ventral nerve. Nch, Notochord. R.sy, Ramus sympathicus of 

 nerve. R. V , R. V" , Branches of the ventral ramus of the spinal nerve. Som, Somatopleure. Sp.c, 

 Spinal cord. Sym, Sympathetic ganglion. V.msn, Vena mesonephrica. IV.D, Wolffian duct. W.t, 

 Wolffian tubule. X 22 diams. 



it comes in contact with the mesentery, mst. The gland contains two kinds of 

 tissue, one, the anlage of the medullary, the other of the cortical portion of the 

 gland. The medullary tissue resembles the neighboring mesenchyma and occu- 



