No. 2.] DEVELOPMENT OF THE HUMAN COELOM. 445 
renal capsule, which is very large, have receded markedly, 
and the pleural cavity already forms a pocket on the dorsal 
side of them. A sagittal section through this region, somewhat 

Fic. 44.— Section through Embryo No. XLIII. Enlarged 8 times. H, hand; A, auricle; V, 
, 
ventricle; Z, lung; S 7, septum transversum; /, phrenic nerve; U, umbilical vein; S, 
stomach ; ”, Wolffian body ; Ov, ovary ; A, amnion; 7-72, ribs. 
distant from the median line, is given in Fig. 44. A transverse 
section of the embryo pictured in Fig. 42 is given in Fig. 43. 
This section is just at the point above the opening, and shows 
the communication between its pleural and peritoneal cavities 
closed on one side, but open on the other. There is a ridge 
on the side of the cavity which projects between the lung and 
