The occurrence of calcification or ossification in the human penis is relatively rare. In the majority of cases the presence of such calcium or bone is the result of local trauma or plastic induration of the penis (Peyronie's disease). Rarely a so-called “os penis” has been reported in the human. Very few radiological demonstrations of penile calcification or ossification are to be found in the literature. In view of this, the following case may be worthy of record. A 53-year-old African male, J.M., was admitted to hospital in September, 1959. He complained of intermittent attacks of pain in both hip joints and stiffness of the back of two years' duration. During the course of investigation a radiograph of the pelvis was taken and this demonstrated the presence of calcification within the penis (Fig. 2). Further interrogation of the patient revealed that he had been the unfortunate recipient of a kick on the penis approximately two years prior to his present admission to hospital; the organ was not swolle...