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Show 88 MR. A. SANDERS ON THE MYOLOGY OF PHRYNOSOMA. [Jan. 6, Peronaus secundus (fig. 5, P.S.) arises from the distal four fifths of the fibula, and is inserted into the posterior edge of the cuboid. Flexor perforans digitorum arises from rather less than the proximal fourth of the fibula; it receives a muscular slip from the perforatus, and terminates in a broad tendon in the sole, which, passing over the tarsus, receives a musculo-tendinous slip from the tibialis posticus; the tendon for the fifth digit is given off first as usual, in this case opposite the proximal end of the cuboid; four other tendons subsequently arise, which are inserted into the distal phalanx of their respective digits. A muscular slip arises from the cuboid to be inserted into the fibular side of the broad part of the tendon. Four muscular slips, which together form a Flexor accessorius, arise from this part of the tendon ; that for the fourth digit, from the superficial surface, ends in a long tendon inserted into the third phalanx of that digit; the three others are derived from the deep surface, and are inserted respectively into the base of the first phalanx of the second, third, and fourth digits. Tibialis posticus resembles the muscle of that name in L. belli. Extensor longus digitorum (fig. 5, E.L.) arises as usual from the front part of the external condyle of the femur by a tendon which passes through a groove formed by the head of the fibula and that of the tibia ; it terminates by two tendons, which are inserted, one into the fibular side of the base of the third, and the other into the corresponding side of the fourth metatarsal bone. Tibialis anticus (fig. 5, T.A.) resembles that muscle in L. belli, except that it has no supplementary tendon. Extensor brevis digitorum (fig. 5, E. B.) resembles the same muscle in L. belli, but is not so complicated. It arises from the cuboid, and gives a slip to each of the digits from the first to the third ; the fourth has an extensor muscle to itself, which, together with an abductor for the same digit, arises from the cuboid. In the sole there is an adductor digitorum, consisting of three slips, which, crossing the sole obliquely, are inserted respectively into the base of the first phalanx of the hallux and the second and third digits. There are also three palmar interossei, but no appearance of lumbricales. LIST OF EXPLANATORY LETTERS USED IN THE WOODCUTS. They are the same in all. A.M. Adductor magnus. B.A. Brachialis anticus. B.F. Biceps femoris. C.B.I. Coraco-brachialis longus. C.B.br. Coraco-brachialis brevis. C.C. Constrictor cloacae. C.E. Coccygeus externus. C.I. Coccygeus internus. B. Deltoid. B.C. Dilatator cloacae. E.B. Extensor brevis digitorum. E. C. V. Extensor carpi ulnaris. E.L. Extensor longus digitorum. E.M. Extensor metacarpi pollicis. En.P. Entopterygoid. F.C.R. Flexor carpi radialis. F.F. Flexor femoris. F.S. Flexor perforatus or sublines. G. Gracilis. G.H. Cenio-hyoglossus. Gl.Md. Gluteus medius. Gl.Mx. Gluteus maximus. H.G. Hyoglossus. in.c. Interarticulav cartilage of knee-joint. |