n8 The Alligator and Its Allies 



So far as yet known this muscle is not present in 

 other reptiles. 



MUSCLES OF THE POSTERIOR APPENDAGES 



Ambiens (Plate III., Figs, i and 2, amb, Plate 

 IV., Figs. 2 and 4, amb, Plate V., Figs. 2 and 3, amb) 

 (Part I., Rectus femoris and Sartorius partim, 

 Vastus internus, Innere Streckmuskelmasse) (Part 

 II., Gracilis, Rectus femoris, Sartorius). Arises by 

 a short tendon from the anterior spine of the ilium, 

 near its union with the pubis. The muscle swells 

 quickly to a thick belly which, lying under the skin 

 on the forward and inner side of the upper thigh, is 

 again reduced to a small, flat tendon which extends 

 abruptly over the anteromedial surface of the knee 

 joint to its outer side; it then passes through the 

 complex of tendons of the femoro-tibialis muscle, 

 beneath which it unites with the tendon of origin 

 for the peroneus posterior muscle. 



To this muscle is the following strange muscle to 

 be ascribed (Part II) : it springs, small in extent, 

 from the inner surface of the os pubis near the 

 acetabulum, extends thence forward around the 

 pubis, and runs into a long, thin tendon which 

 unites with the insertion tendon of the subcutaneous 

 extensor ilio-tibialis muscle. 



Extensor Ilio-tibialis (Plate III., Fig. 2, ex. il. tb.) 

 (Part I., Rectus femoris, Adductor flexor, Glutasus 

 maximus; M. du facia lata, Vastus externus, 



