.MUSCLES OF THE HIND LIMB 99 



and each of these again divides ; there are thus four tendons, 

 of which the two middle ones supply the third toe. In 

 PtilonorJii/neJii/x riolacciiH the tendon first gives off a branch 

 to the second toe, and then divides for the third and fourth. 

 In tthaniphastos carinatitx all three branches are given off at 

 the same level. In Pharomacrus mocinno the extensor sup- 

 plies only the two middle digits. In Scopus there is a slight 

 variation of what is found in Gnis, Nothura, &c. The 

 tendon divides into three, and the middle one again divides 

 into two, both of which latter supply the middle digit. 

 The superficial flexors of the foot consist of- 

 Flexor Perforatus et Perforans Indicts (fig. 51). Arising 

 from the outer condyle of the femur, and from the septum 

 between itself and adjacent muscles ; its tendon is inserted 

 on to base of second phalanx of its digit. 



Flexor Perforatus et Perforans Medii. Has two heads 

 of origin, one as in last, the other from fibula. Its tendon 

 perforates that of flexor perforates of the same digit, and is 

 perforated by flexor profiuulns ; it is inserted on to base of 

 second phalanx (in Palamedea, third in Ciconia} of its 

 digits. 



Flexor Perforatus. This muscle (see figs. 5'2, 53) arises 

 from two heads, an inner head from the intercondylar notch 

 and an outer head from the outer condyle of the femur. As 

 will be seen from the annexed cuts, those portions of the 

 muscle which supply digits III. and IV. have slips from both 

 heads, but not that which supplies digit II. These muscles 

 also arise either from the ambiens or from the fibula, as has 

 been explained above under the description of the ambiens. 

 The tendon to digit II. is inserted at the base of the first 

 phalanx, that to digit III. is usually joined by a vinculum 

 (absent in Opisthocomus, As to otus, and Ehijt idiceros plicat tin) 

 to tendon of flexor perforates et perforans medii, and is 

 inserted on to base of second phalanx of digit III. The third 

 tendon has four slips of insertion, on to four proximal 

 phalanges of digit IV. The descriptions of the insertion of 

 these tendons applies to Ciconia iiigra. There are varia- 

 tions. 



H2 



