446 MALL. [Vou. XII. 
the liver and continues down to the suprarenal capsule. This 
ridge has been well described by Ravn,! who gives an excellent 
illustration of the opening with the ridge encircling it. 
4 
4 
4 

Fic. 45.— Reconstruction of Embryo No. X. Enlarged 8 times. 2-72, dorsal ganglia; S C, supra- 
renal capsule; 1”, Wolffian body; A, kidney; Z, liver; S, stomach; C, caecum. The 
dotted area on the ventral side of the liver indicates the extent of the ventral mesentery of 
the liver. 
In all the embryos in which the pleural and peritoneal cavi- 
ties still communicate, the vena cava does not yet communicate 
with the posterior cardinal vein. 
Fig. 45 is from an embryo slightly larger than the one from 
which Fig. 42 was taken. The pleuro-peritoneal communica- 
1 Ravn: His’s Archiv, 1889, Plate X, Fig. 16. 
