While processing specimens in the collection of mammals at the University of Museum of Natural History, I noted injuries to bones of two muskrats, Ondatra zibethicus, and a striped skunk, Mephitis mephitis. One of the muskrats, an adult of unknown sex (KU 6624), was obtained in eastern Kansas on 23 November 1927, and was given to the Museum by C. W. Ogle. In this specimen the right scapula (Fig. 1) has a truncated infraspinous fossa and a roughened projection along the axilliary border The remainder of the skeleton is normal. Application of the head of the right humerus to the fossa for its reception indicated that locomotion was unimpeded. The second muskrat, an adult male (KU 72880), was obtained by J. R. Alcorn on 21 February 1957, 10 miles north-northeast of Stillwater, Churchill Co., Nevada. From a recessed area on the ventral surface of the left side of the mandible three openings into a cavity that contained an abscess are visible (Fig. 2). Another opening of comparable size is situated in a pit on the medial side of the bone five millimeters below the alveolar lip for the first molar. The jaw is swollen ventrally. A cut or a bite inflicted by another animal possibly exposed the dentary to infiltrating bacteria, which attacked the bone tissue. The skunk, an adult male (KU 91400), was taken by A. B. Mickey on 1 December 1948 at Laramie, Albany Co., Wyoming. An irregular bridge of bone connects the zygomatic arch with the postorbital process