Lion ♂ (_Felis leo_). Ten and one-half months old. Cystic parenchymatous goitre, dilatation of esophagus, ulcerative enteritis. Acute glomerular nephritis. Chronic hyperplasia of spleen. Fatty infiltration of liver. Bronchopneumonia (from pressure of goitre). Ascaris in intestines. Had lump on neck for several weeks, ate very little and seemed to have hard work to get anything down. Stopped eating toward the last and vomited water and foam. There is a small ulcer with everted lips just below left incisor on lower lip which the keeper says is of several months’ duration. The thyroid is much enlarged and forms a large mass in the upper chest and extends far up in the neck. Because of this mass the lungs are pushed far down in the chest. Heart also lies very low. The thyroids are enormously enlarged and cystic, the right measuring 13 × 8.5 × 5 cm. and the left 19 × 9 × 5 cm. The lungs are pale pinkish white. Air content increased in places, decreased in others. No hypostatic congestion. The lungs seem normal except at the apex where they are collapsed probably from pressure on lung by enlarged thyroid which dips down into the chest for at least three inches filling entirely the apex of the chest. One bronchial lymph gland was about the size of a walnut, the rest were normal. The heart seems normal except for its slightly low position. The abdomen contains about 300 c.c. of deep yellow highly albuminous fluid. No adhesions. The liver is softer than normal, glistening, smooth, moist and very yellow particularly at the edges. The gall- bladder contains a green mucoid bile and the duct is patulous. Spleen and kidneys are normal. Mouth and pharynx are normal. The esophagus is much dilated above the thyroid. The enlarged thyroid pressing upon it, has acted as a distinct obstruction. In this pouch was a large amount of food probably (from the history) eaten two days before. The esophagus below this point was normal except for the presence of thin mucus. Stomach empty save for two small bits of meat. The duodenal walls are much thickened, mucosa covered with small ulcers many with a hemorrhagic base; there were present also a few small, round worms. [Illustration: FIG. 14.—DILATATION OF ESOPHAGUS. LION (FELIS LEO). DILATATION PROBABLY DUE TO OBSTRUCTION BY ENLARGED THYROID BODY. IN ILLUSTRATION DISTENTION OF ESOPHAGUS CAN BE SEEN IN THE FORK OF THE THYROID LOBES. ]