612 ON THE FAT-BODIES OF THE SAUROPSIDA. [Dec. 3, 
Monitors do not seem to show any special approximation to the 
Crocodiles ; and in this respect the only important difference between 
the former and other lizards appears to be that the lungs do not lie 
in the same cavity with the liver. It is doubtful if this difference 
is of any importance to the systematist. 
VIII. EXPLANATION OF PLATES LIX, & LX. 
al. alimentary canal. 
ao. dorsal aorta. 
a.v. vitelline artery. 
b/. urinary bladder. 
¢.a. corpus adiposum (fat-body). 
ca.c. circumadiposal cavity. 
er.c. circumrenal cavity. 
c.w. Wolfian body. 
g. genital gland. 
h, liver. 
m. median septum (mesentery or ligaments supporting alimen- 
tary canal). 
2. central nervous system. 
0. Ovum, 
od. oviduct. 
pp.c. pleuroperitoneal cavity (main body-cavity). 
pul. lung. 
pr. pelvic girdle. 
re. kidney. 
v.a. anterior abdominal or allantoic vein. 
v.¢.4. vena cava inferior. 
v.d. vas deferens, 
vv, Vitelline vein. 
a. pulmohepatic ligament. 
2'. pulmohepatic recess of left side. 
Figs. 1-17. Transverse sections of Lizards and Snakes (chiefly the former), to 
show the relations of the fat-bodies and circumadiposal spaces to the 
pleuroperitoneal cavity and the general relations of the abdominal 
vicera. 
Figs. 1-7. Transverse sections of advanced embryo of Amphisbena darwinii, 
drawn from behind. The sections are in order from before back- 
wards. 
Fig. 8. Transverse section of common Adder, taken at such a place that it 
passes through both kidneys. 
Fig. 9. Transverse section of advanced embyro of the common Grass-Snake, 
through one kidney and the embryonic genital gland. 
Fig. 10. Transverse section of adult 2 of common Grass-Snake, through one 
kidney; a large egg in the duct (distorted) fills most of the body- 
cavity. 
Fig. 11. Transverse section of a specimen of Lacerta, in which the fat-bodies 
were specially well developed and extended forward further than 
usual, 
Fig. 12. A more posterior section of the same animal, through the region of the 
kidneys, showing that in some regions the peritoneum hardly wraps 
round the kidneys or fat-bodies at all. 
Fig. 13. A transverse section of another specimen of Lacerta viridis, showing 
a similar relation of the kidneys to the peritoneum in the region 
chosen. 
Figs. 14-17. Transverse sections of a young Monitor niloticus. The sections in 
order from behind forwards. 
We note here that the cirewmadiposal cavity extends forwards ventral to the 
