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Show 1870.] MYOLOGY OF PLATYDACTYLUS JAPONICUS. 423 Coccygeus inferior arises from the haemal spines of the third, fourth, and fifth caudal vertebrae, and is developed into a broad vertical tendon attached to the centra of the first and second caudal vertebrae, and to the sacrum, which with its fellow of the opposite side forms a partition between the two halves, embracing and being attached to the posterior end of the cloaca; the anterior extremity of the free edge of this tendon is inserted into the postero-external angle of the ischium. Pyriformis is situated between the coccygeus medius and inferior, arises from the centra of the first six caudal vertebrae, and from the haemapophyses of the third, fourth, fifth, and sixth, and passing forward through the tendinous intersection it ends in a flat tendon, which winds round the trochanter, and is inserted into the femur at its base on the anterior surface ; before arriving at the femur it gives off a long and slender tendon, which passes down the thigh to join the aponeurosis covering the flexor muscles of the leg. Quadratus femoris arises from the posterior point of tbe ilium, between the origin of the biceps femoris and the insertion of the coccygeus superior; passing directly towards the ventral surface, it joins the tendon of the last muscle, and in addition is inserted into the posterior edge of the trochanter by a tendon of its own. Iliacus arises from the concave ventral surface of the pubis and from the membrane, filling up the space between it and the ischium ; superficially it is divisible into three portions; but the divisions do not run deep ; the fibres converge and are inserted into the summit of the trochanter, having somewhat the aspect of the subscapularis. I have ventured to call this iliacus on account of its insertion, its origin, although coming from the proper direction, being from a different bone to the one it ought to be in order to make the analogy complete. Adductor brevis.-This muscle regarded superficially looks as if it formed part of the iliacus ; but dissected deeper it is found to have a separate insertion; it arises from the side of the ischium, and is inserted into a fossa on the dorsal side of the trochanter, internal to the insertion of the quadratus femoris. Capsularis arises from the postero-lateral margin of the ischium, covered by the last muscle, and is inserted into the dorsal part of the capsular ligament of the femoro-pelvic articulation. Adductor magnus arises on the internal or dorsal surface of the pelvis by three heads :-one from the anterior border of the ischium ; the other from the internal surface and anterior edge of the pubis, appearing on the ventral aspect; the other from the membrane between the two bones. The fibres converge, and passing over the front of the ilium through the arch formed by the abdominal muscles are inserted into the ventral aspect of the shaft of the femur for nearly one-half of its length, ventrad of the crureus and dorsad of the pectineus. The action of the muscle being to adduct and flex the thigh upon the pelvis, it seems more nearly to correspond with the adductor than with any other. Gluteus medius arises from the ilium, in front of the origin of the |