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Show 548 MESSRS. BEDDARD AND MITCHELL ON THE [June 19, Interosseus dorsalis.-The fleshy heads of this muscle arise from the greater part of the internal surface of the shaft of the second metacarpal and from the first quarter of the third metacarpal. The common tendon is inserted at the base of the second phalanx of the second digit. Interosseus palmaris.-The origin of this is partly from the shaft of metacarpal III., but chiefly from the second metacarpal. The tendon is inserted to the flat part of the first phalanx of the second digit. Muscles of the Thigh and Leg. (Figs. 4, p. 549, & 5, p. 552.) Sartorius.-This is very large and strong, it is separated by a wide space from the gluteus maximus. It arises from fascia over the gluteus medius, and from the anterior upper and lower margins of the ileum. It is inserted on to the ligament containing the patella and on to the crest of the tibia. The patella was not ossified, but was represented by a cartilaginous nodule. Gluteus maximus.-There is no postaeetabular part of this muscle. The origin is entirely tendinous from fascia over the gluteus medius and from the ridge of the ileum above the acetabulum as far as the anterior margin of the biceps, with which it was fused for a short distance. The insertion is entirely tendinous to fascia covering the vastus and the cruraeus. The innervation of the muscle, so far as it has yet been described, was from the crural plexus. At the posterior margin of the muscle is a separate well-developed muscular slip innervated by a twig from the ischiadicus. This part probably represents the postaeetabular division of the muscle. Gluteus anterior.-This is a small but very distinct triangular muscle arising fleshy from the ridge of the ileum above the acetabulum, being covered exactly by the part of the preceding muscle which arises from the same region ; its tendon rapidly narrows to its insertion on the outer face of the femur between the tendons of the external obdurator and those of the third and fourth gluteals. It is the most superficial of the muscles inserted on to the upper extremity of the femur. Its nerve comes from the ischiadic plexus. Gluteus medius.-The origin of this strong muscle underlaps that of the sartorius, but does not extend to the anterior edge of the ileum. The fleshy origin is confined to the ileum, and the strong short tendon is inserted broadly on to the outer face of the head of the femur; it has a double innervation, a large branch from the crural plexus, and a small twig from that branch of the ischiadicus that supplies the gluteus anterior. Gluteus minimus.-This muscle arises fleshy from the anterior lower border of the ileum, not reaching on to the ribs, and contiguous with the lower margin of the medius in its anterior region, while near its insertion it is separated from that muscle by the gluteus quartus. It is inserted tendinously on to the upper end of the shaft of the femur lower dow?n than the insertion of the |