The Muscles 119 



Tensor facile latse, Tensor femoris vagina, Glutseus 

 minimus, Tensor facile femoris). This muscle, in 

 the CrocodiHa, consists of two parts: 



I. The chief part is long and broad, and springs 

 as a tendon from more than the anterior half of the 

 lateral border of the dorsal crest of the ilium, cover- 

 ing the origin of the ilio-fibularis muscle. Its 

 insertion, by a broad, flat tendon, overlying the 

 femoro-tibialis muscle, together with the tendon of 

 this muscle, is on the anterior surface of the head 

 of the tibia. 



II. The second, significantly smaller and nar- 

 rower, part arises outside of the quadratus lum- 

 borum by a short tendon from the most dorsal 

 end of the ilium; it goes over, medially, along the 

 nearer head of the ambiens muscle, then to the 

 anteromedial side of the upper leg, into the deeper- 

 lying femoro-tibialis muscle. 



Femoro-tibialis (Plate III., Fig. i, fm. tb., Plate 

 IV., Fig. 2, fm. tb., Plate V., Figs, i and 3, fm. tb.) 

 (CruTceus et Vasti, Cruralis). Arises by an ante- 

 rior inner and a posterior outer head ; both heads 

 arise from the outer-anterior and inner surfaces of 

 the femur, and unite with each other and with 

 the extensor ilio-tibialis and ambiens muscles as a 

 strong tendon, which extends over the knee and 

 is inserted on the anterior border of the head of 

 the tibia; this tendon incloses, like a sheath, the 

 end-tendon of the ambiens muscle. 



Ilio-fibularis (Plate III., Fig. 2, il. fib., Plate IV"., 



