88 MR. A. SANDERS ON THE MYOLOGY OF PHRYNOSOMA. [Jail. 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 perf or ansdigitorum 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 musculotendinous slip from the tibialis posticus ; 

 the tendon for the fifth digit is given off first as usual, in this case oppo- 

 site 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 fourtli 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 appear- 

 ance 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. 

 CB.br. Coraco-brachialis brevis. 

 C.C. Constrictor cloacae. 

 C.E. Coccygeus externus. 

 CI. Coccygeus internus. 



D. 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.8. Flexor perforatus or subli- 

 mit 

 G. Gracilis. 

 G.H. Genio-hyoglossus. 

 Gl.Md. Gluteus medius. 

 Gl.Mx. Gluteus maximus. 

 H.G. Hyoglossus. 

 in.c. Interarticular cartilage of 

 knee-joint. 



