120 The Alligator and Its Allies 



Pig. 2, il. fib., Plate V., Fig. 3, il. fib.) (Biceps 

 cruris, Semitendinosus + Semimembranosus, Glu- 

 tasus maximus, Abductor fibularis, Flexor abductor 

 cruris). This consists, in the Crocodilia, of two 

 entirely separate small, band-like muscles. The 

 first springs by a short tendon from the lateral 

 surface of the middle ilium, very near the origin of 

 the caudali-ilio-femoralis and extensor ilio-tibialis 

 muscles. The chief part of the end-tendon is in- 

 serted at the end of the first sixth of the fibula, 

 on its outer-forward corner near the origin of the 

 peroneus anterior muscle ; a shorter tendon-branch 

 goes to the tendon of the peroneus posterior mus- 

 cle; and a third, still smaller branch goes to the 

 caput femorale of the gastrocnemius muscle, by 

 which it contributes to the structure of the lateral 

 part of the tendo-communis externus. 



The second part springs, by an equally short 

 tendon, very near the first, from the hinder end of 

 the dorsal crest of the ilium, goes directly over the 

 preceding to the knee, where its tendon unites with 

 that of the extensor ilio-tibialis muscle. 



Ilio-femoralis (Plate III., Fig. 2, il. fm., Plate IV., 

 Fig. 2, il. fm., Plate V., Fig. i, il. f.) (Glutams, 

 Quadratus femoris [?], Glutasus medius). This 

 muscle is inwardly fused with the caudali-ilio- 

 femoralis, whose anterior part it forms. 



Caudali-ilio-femoralis (Plate III., Fig. 2, cd. il. 

 fm., Plate IV., Fig. i, cd. il., fm.) (Zweiter Aus- 

 wartsroller, Extensor femoris caudalis accessorius, 



