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Show !>62 MR. ST. GEORGE MIVART ON THE [Dec. 6, backward to the end of the tail, and, except toward the root of that organ, forms fully half of each lateral caudal mass. Fig. 8. Inner side of right pectoral limb. Ji. Biceps. B. P. Flexor brevis poliicis. C. B. Coraco-brachialis. C. S. Costo-coracoid ligament. F. P. Flexor longus poliicis. F. R. Flexor radialis. F. U. Flexor ulnaris. L. Levator clavicular. L. D. Latissimus dorsi. M.P. Extensor metacarpi poliicis. P.T. Pronator teres. Sl, S2. Subscapularis. 8. M. Serratus magnus. St. S. Sterno-coracoid. T. I. Internal part of triceps. Transversus perinei (figs. 4 and 27, T). A muscle may perhaps be thus named which meets its fellow of the opposite side in the subcaudal middle line, behind the cloacal opening. Anteriorly it blends with what I provisionally distinguish as the gluteus maximus ; posteriorly it loses itself in a delicate fascia enclosing the infero-caudal. Infero-caudal (figs. 4 and 27, C. D). This muscle runs along the middle of the under surface of the tail for its whole length, passing, anteriorly, above the transversus perinei, and beside the cloacal aperture internal to the ischio-caudal. It ends on the postero-ex-ternal wall of the cloaca. The ischio-caudal (figs. 4 and 27, /. C) springs from the under part of the postsacral caudal vertebrae (from about the fourth to the twelfth), side by side with its fellow of tbe opposite side of the tail. Passing forward within the cloacal muscle, it is inserted into the tuberosity of the ischium. The cloacal muscle (figs. 4 and 27, L. C) arises from beneath the tail, about the twelfth postsacral vertebra. It passes forward |