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Show 268 MR. ST. GEORGE MIVART ON [Apr. 22, postsacral. It comes to the surface between the adjacent sides of the femoro-caudal and ischio-coccygeal muscles, and is inserted into the posterior edge of the semitendinosus a little after the latter muscle has left the ischium. The ischio-caudal (figs. 7 & 10, I. C) passes forwards beside the cloacal aperture, and therefore forms the most median part of the subcaudal muscular mass. It springs from the hypapophyses of the first four caudal vertebrae, and is inserted into the postero-extemal angle of the ischium. Femoro-caudal (figs. 7, 8, 9, & 10, F. C). A rather large muscle which I thus name comes out of a sort of muscular sheath on each side of the proximal part of the under half of the tail. The sheath is formed by the ilio-caudal above, and by the semimembranosus below ; and the muscle springs from the sides of the hypapophyses of two or three of the anterior caudal vertebrae. It is inserted by a strongish tendon into the flexor surface of the femur just below the great trochanter, just behind and outside of part of the insertion of the adductor. Fig. 8. Superficial muscles of outer side of hinder part of trunk and anterior part of tail, and of the dorsal (extensor) side of right pelvic limb. E. S. Erector spinas. E. L. D. Extensor longus digitorum. F. C. Femoro-caudal. G. Mx. Gluteus maximus. /. Iliacus. II. c. Ilio-caudal. /. P. Ilio-peroneal. 7?. F. Rectus femoris. S. M. Semimembranosus. S. T. Semitendinosus. Ilio-caudal (figs. 7, 8, 9, & 10, II. C). This is that part of the infero-lateral caudal muscular mass which is inserted into the posterior aspect of the ilium. The insertion is just above the origins of the gluteus maximus and biceps. Gracilis (figs. 7 & 10, G). A very large sheet of muscle may |