is at most scarcely one-sixth of an inch long, and consists of only
three or four joints, often lives in large numbers in the intestine of
the dog without injuring its host, but causes huge cysts (from the size
of a pigeon’s egg to that of a child’s head) in the liver, lungs, or
other organs of man, pig, and ruminants. These cysts are of the type
represented on the right of Fig. 138. They may prove fatal, owing to the
pressure they exert in the organs containing them and the blood-vessels
of the same.