In this paper the writer directed attention to the remarkably developed parotid glands of the beaver, which form a single large mass covering the whole front and sides of the neck, and cannot be separated from one another. He showed how the apparent disproportion between the anterior and posterior extremities of the beaver was increased by the way in which the parietes of the abdomen overhung the thighs, and the margin of the panniculus carnosus passed over the knees so as to include them in the muscular investment that enveloped the trunk.