As early as 1803 Franz Carl Naegele1 recognized the morphology of the obliquely ovate pelvis and in his celebrated monograph published in 1839 he based his observations on the study of 37 specimens. He defined the deformity as a "pelvis contracted in one of the oblique diameters with complete ankylosis of the sacroiliac synchondrosis on one side, combined with imperfect development of the sacrum and os innominatum on the same side." At the time of his writing, Naegele observed that the deformity had never been recognized in the living person. Today, without the aid of roentgenology, the same difficulty of diagnosis apparently obtains, as witnessed by the experience here reported. When one considers the supposed rarity of this type of pelvic deformity, the observation of 4 cases in almost as many years in the material presenting itself in a relatively small teaching clinic is something of a revelation. In