A case of tuberculous prostatitis and seminal vesiculitis was seen in a Japanese Macaque (_Macacus fuscatus_). Judging by the advanced stage of these lesions and their more recent character in other viscera, the disease was suspected as pelvic in origin, possibly due to infection by a thermometer. Whether or not such be the case cannot be established, but at all events, separate thermometers kept in carbolated vaseline were employed after this death. The females caged with this animal did not develop tuberculosis of the pelvic organs. SECTION XI THE DUCTLESS GLANDS THE THYROID BODIES. The ductless glands occupying the anterior cervical regions, known as the thyroids and parathyroids are structures to be found in some form in all vertebrates, but increase in distinctness of outline and construction upward in the zoological scale. In the bird they present themselves as discrete rounded bodies lying well to the side of the midline resting usually upon the carotid artery or jugular vein or both. As one removes the skin reddish brown globular masses will be exposed to view, sometimes showing an irregular lobular outline, a variation due to separate but attached masses of parathyroid glandules; the latter may be yellowish or even white. For the most part, however, distinct thyroid and parathyroid bodies are separated with difficulty, and one must discover the latter by microscopical section. In the mammal these organs are by no means so readily found when removing the cervical integument, for they are usually buried beside the trachea and covered by sternohyoid and sternothyroid muscles. Their position, relative to the larynx and upper end of the sternum, varies considerably but this seems to have little importance in the enlargements to which the gland is liable. It is, however, lower, that is more posterior, than in the human being, rarely rising as high as the lateral thyroid cartilages. The principal lobes are elliptical or roughly triangular masses with their long axis corresponding to that of the animal’s body and apposed mesially to the trachea. When enlargement occurs it develops in the anterior or ventral direction, pushing through the cleft between the muscles and the trachea to present under the cervical skin. In quadrupeds it may become dependent and the swelling is nearer the sternum than is the case in man. The isthmus is a very variable structure, and its presence or absence cannot be said to be a constant character in any order, or indeed in any family. I have seen in old animals a fibrous band extending over the face of the trachea connecting the capsule of the lateral lobes, which might have been an isthmus at one time. From these few observations the idea of atrophic fibrosis occurred to me. Such may be the reason for the absence of this transverse link in some adult specimens.