448 MALL. (Vox. XII. 
Minot! has stated that the pleural cavities are to be con- 
sidered a portion of the septum transversum, because they lie 
on the dorsal side of it. From what has already been said 
above it will be seen that I consider the septum transversum the 


= 







Fic. 46. — Reconstruction of Embryo No. VI. Enlarged 8 times. 7-72, dorsal ganglia ; S C, supra- 
renal capsule ; A, kidney ; W”, Wolffian body ; S, stomach; C, caecum; Z, liver. The dotted 
area on the ventral side of the liver indicates the extent of the ventral mesentery. 
mass of tissue between the pericardial cavity, the pleural cavities, 
and the opening between the two sides of the peritoneal cavity 
immediately below the liver, marked O in Figs. 16 and 30. 
This tissue includes the membrana reuniens, which is really the 
wings of the septum transversum as described by His. In my 
1 Minot: Human Embryology, p. 483. 
