'230 MISS M. POOLE ON THE DEVELOPMENT OF THE _ [{ Mar. 2, 
out [1, 2,12]. Here the post-hepatic septum is well developed, and 
passes from its anterior dorsal attachment to the vertebral column, 
behind the liver-lobes and pericardium, to unite posteriorly with the 
ventral body-wall. As in birds, it encloses the stomach within its 
thickness, and carries on its ventral surface the anterior abdominal 
veins to the liver. It is attached to the lateral body-walls 
throughout its extent, so as to separate completely the pulmo- 
hepatic from the abdominal portion of the celom. Butler describes 
in a very young specimen a small passage between the abdominal 
cavity and the right pulmo-hepatic recess; but this presumably 
becomes closed at a later stage, for there was no such communi- 
cation in the other animals which I dissected. The post-hepatic 
septum is apparently split secondarily in its ventral portion, and 
the flap thus formed on each side is closely applied to the liver- 
lobe so as to form a posterior wall to the liver-sac, and—together 
Text-fig. 35. 
LP. hp. spt. 
\ 
eNO 
Diva GT / 
ERP St. Php.c. Ben 
Young Crocodile bisected in the same way as Chick in text-fig. 34, p. 223. 
with the oblique ligament of the liver with which it is connected 
—to shut off the pulmo-hepatic cavity from a subseptal, ventral, 
post-hepatic space. There is a large pulmo-hepatic cavity extend- 
ing right round from the dorsal attachment of the post-hepatic 
septum to the ventral attachments of the oblique ligaments of 
the liver, perfectly continuous except for a narrow partition 
projecting a little way inwards from the ventral body-wall. ‘The 
pulmo-hepatic recesses seem to correspond almost exactly to those 
spaces in birds, lying as they do between the ventral surfaces of 
the lungs, the dorsal margins of the liver, and the post-hepatic 
septum; and I believe that tissue which forms the roof of each 
recess, and covers the postero-ventral face of each lung, represents 
the post-pulmonary septum of birds. Text-fig. 36 is a dissection 
from the ventral side of a young specimen of Crocodilus palustris. 
It shows the continuous pulmo-hepatie cavities closed off behind 
