1889.] THE BODY-CAVITY IN LIZARDS, ETC. 467 
as being very peculiar; but it is Jed up to in other genera of the 
Teiide. Thus, in Ameiva and Callopistes the median ventral liga- 
ment is, as it were, expanded laterally behind the liver, or it may be 
said to give off at right angles on either side a membrane which 
dorsaily becomes attached to the hinder part of the liver. 
In Ameiva and Callopistes, however, the transverse vertical septum 
thus formed is not continuous with the lateral walls, and there is a 
free passage on either side. But in Tupinambis (see Plate XLVIII. 
fig. 32, which is a view of the septum from behind, ventral side 
uppermost) the subdivision of the body-cavity is much more com- 
plete. On the right side there is only a very small aperture of 
communication (0) between the pulmohepatic and intestinal cavities. 
This is situated on the dorsal side external to the inferior vena cava 
and the attenuated extremity of the right liver-lobe, which is repre- 
sented as visible through the septum. On the left side there is a 
larger, but still comparatively small, aperture (0’) also dorsally 
situated. 
Figs. 33 & 34 give side views, ventral side uppermost, of this 
post-hepatic septum (3), and the organs contained in the pulmohepatic 
cavity in front of it. The whole lateral body-wall next the observer 
is supposed to be removed. In fig. 31, on the right side (left of 
observer), only the ventral part of this septum is displayed, the more 
dorsal part lying concealed beneath this, together with the extremity 
of the right liver-lobe. 
This post-hepatic septum I have throughout indicated by the same 
letter (@) as the more ventral, or omental, part of the post-hepatic 
septum of birds, in accord with my opinion that they are homologous ; 
since the position of the foramen of either side seems to make it clear 
that there is no component growing in from the dorsal side corre- 
sponding to the oblique abdominal septum of the bird. This is just 
what we should expect, there being no development of abdominal 
air-sacs. 
The difference between the adult condition of these Tecide and 
that of the other type of Lizard would seem to imply that the vena 
cava inferior of the former, instead of developing, as in Lacerta, 
Gallus, and Lepus, in tissue continuous with the posterior part of the 
pulmohepatic ligament, has arisen in a lateral transverse outgrowth 
of the dorsal part of the longitudinal median septum or mesentery, 
in fact in a membrane situated altogether posterior to the place 
where the pulmohepatic recess would lie if present. 
The need of some such transverse membrane, in the absence of the 
pulmohepatic ligament, to carry the vena cava inferior to the liver, 
accounts for the dorsal portion of the post-hepatic septum in the 
Teiide. 
To the relations of the lungs in the Teiidee I have already referred 
(p. 465). 
V. Ox Tur Bopy-cavitry or THE CROCODILIA. 
Turning now to the Crocodiles. In the absence of any data as to 
the development of the septa in these animals (such as we possess in 
