Fic. 88.—The internal organs of a Puff Adder (Bitis arietans). (1) Figure on the left, the lung. The 
dark line running down over the surface is the windpipe. The airentry is at t marked A. Higher 
up at B is top of lung. C is entrance to the windpipe. D is the ende ortion which snake can 
protrude from the jaws in order to breathe when swallowing large prey, which causes great distension 
of jaws. (2) Gall bladder. (3) Liver. (4) Heart. (5) Figure on right, the whole dig 
The top is entrance to gullet leading from mouth down to stomach, which is the largest portion in 
centre. Lower portions marked E are intestines. The slightly larger part at end of bowels is the 
cloaca, and vent. Central figure is a Puff Adder laid open. (1) Fang. (3) Lower jaw. (6) Poison 
gland. (7) Tongue. (9) Windpipe. (10) The stomach (coloured white) showing gullet leading down 
from mouth. The black-looking parts on which it rests are masses of yellowish fat. (11) Beginning 
of the intestines (covered with fat). (12) Heart. (13) Veins and arteries. (14) Lung (coloured 
black). White streak along it is the windpipe. (15) Entrance of windpipe into bottom of lung. 
(16) Liver. (17) and (18) Intestines. These are enveloped in fat. (19) Vent. (If the numbers 
appear indistinct, use a small magnifying glass.) 
