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Show 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. bl. urinary bladder. ca. corpus adiposum (fat-body). ca.c. circumadiposal cavity. cr.c. circumrenal cavity. c.w. Wolfian body. g. genital gland. h. liver. m. median septum (mesentery or ligaments supporting alimentary canal). n. central nervous system. o. ovum. od. oviduct. pp.c. pleuroperitoneal cavity (main body-cavity). pul. lung. pv. pelvic girdle. re. kidney. v.a. anterior abdominal or allantoic vein. v.c.i. vena cava inferior. v.d. vas deferens. v.v. 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 tbe pleuroperitoneal cavity and the general relations of the abdominal vicera. Figs. 1-7. Transverse sections of advanced embryo of Amphisbcena darwinii, drawn from behind. The sections are in order from before backwards. 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 tbe common Grass-Snake, through one kidney and the embryonic genital gland. Fig. 10. Transverse section of adult § 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 tbe 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. W e note here that the circumadiposal cavity extends forwards ventral to the |