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Show 1870.] MYOLOGY OF CHAMELEON PARSONII. 877 Femoro-caudal (figs. 17, 24, & 27, F. C & y). This is large and fleshy, and arises beneath the transverse processes of the four caudal vertebrae behind the sacral vertebrsc. The anterior and smaller part of this muscle is somewhat separate, and folded over the hinder and larger part. The muscle is in part inserted into the Fig. 20. Deep muscles of back of right leg. E. B*. Extensor phalangorum. F.D2. Flexor tertius digitorum. F.H. Flexor hallucis. G. Gracilis. G.I. Gastrocnemius internus. LP. Ilio-peroneal. P. Peroneus. PP. Popliteus. P.T. Peroneo-tibial. T.P. Tibialis posticus. posterior aspect of the great trochanter; in part it ends in a very delicate tendon (y), which runs along the outer edge of the semimembranosus, the great sciatic nerve crossing it superficially on its outer side. The tendon dips down beneath the head of the flexor tertius digitorum on one side, and the tendon of the gastrocnemius externus and the head of the flexor longus digitorum on the other. It is inserted into the posterior aspect of the interarticular cartilage which is placed between the femur and the tibia. Three muscles, which I cannot at present accurately determine, but which I provisionally designate as gluteus primus, gluteus secundus, and gluteus tertius, pass from the ilium to the outside of the femur. Gluteus primus (figs. 4, 1 7, & 21, D1). This seems to answer to the muscle I have called gluteus medius in the Iguana*. It arises between two heads of the rectus femoris, from the lower part of the outer side of the ilium. Passing downwards, just in front of the gluteus tertius, and beneath the third part of the rectus femoris, it is inserted into the middle of the outer side of the shaft of the femur, between the forked origin of the vastus externus. The gluteus secundus (figs. 17, 22, & 27, D2) springs from the postero-external surface of the ilium, having the femoro-caudal con- * P. Z S. 1867, p. 701. |