232 MISS M. POOLE ON THE DEVELOPMENT OF THE  [ Mar. 2, 
in the previous figure, ‘the incomplete ventral partition between 
the pleural and hepatic regions of the pulmo-hepatic cavity, the 
position of the left pulmo-hepatic recess, and the possible repre- 
sentative of the avian post-pulmonary septum (cf. text-fig. 34 of a 
bird bisected in the same way, and also text-figs. 33, p.223,and 37). 
Text-fig. 37. 
Phrs. Ppu.spt.(?) 
as BGS ene SO Rose ete —— ote 4 
Php.c. Kilizs. NN ‘Po, Llu.lpo 
Ob.lg.lv. 
Diagrammatic plan showing the subdivisions of the ccelom in a Crocodile 
in longitudinal section. 
Huxley first called attention to the similarity between the 
arrangement of the ccelomic subdivisions in Crocodiles and in 
Birds. He describes a fibrous expansion extending from the 
vertebral column ‘over the anterior face of the stomach, the 
liver, and the dorsal and front aspect of the pericardium, to the 
sternum and parietes of the thorax, separating the thoraco- 
abdominal space into a respiratory and a cardio-abdominal cavity, 
and representing the oblique septum of the bird. ... A broad, 
thin muscle arises, on each side, from the anterior margin of the 
pubis; and its fibres pass forwards, diverging as they go, to be 
inserted into the ventral face of the posterior part of the peri- 
cardium and into the ventral and lateral parts of the fibrous 
capsule of the stomach, passing between that organ and the 
adherent posterior face of the liver, and being inserted into the 
fibrous aponeurosis which covers the anterior face of the stomach, 
and represents the oblique septum.” This description appears to 
refer to the whole of that membrane which I have called the 
post-hepatic septum, together with the roof of the pulmo-hepatic 
recesses and the oblique ligaments of the liver; and as I have 
already said, it is only that tissue forming the roof of the pulmo- 
hepatic recess on each side which I regard as possibly comparable 
to the oblique septum (post-pulmonary septum) of Birds. 
On the other hand, Beddard [2] says with reference to the 
muscles described by him in the oblique septa of Puffins and 
