1909. | SUBDIVISIONS OF THE BODY-CAVITY IN BIRDS. 231 
by the oblique ligaments of the liver and the more vertical portion 
of the post-hepatic septum. Nearer the middle line lie the 
ventral liver-sacs between the posterior wall of the pericardium, 
the oblique ligaments of the liver, the post-hepatic septum, and 
the median ventral mesentery. Behind, the post-hepatie septum 
Text-fig. 36. 
Young Crocodile opened from the ventral side. The ventral walls of the peri- 
cardium, pulmo-hepatic cavities, and ventral liver-sacs have been cut away. 
lies horizontally over the stomach, attached both posteriorly and 
laterally to the body-wall (¢f text-fig. 32, p. 222, ofa bird), Text- 
fig. 35 is of the same Crocodile bisected longitudinally a little to the 
left of the middleline. It shows, in addition to the structures seen 
