The Muscles 121 



Glutseus minimus). This forms a thick mass that 

 springs directly from the lateral surface of the 

 anterior and middle parts of the ilium, is covered 

 outside by the ilio-fibularis muscle, and, pushing 

 between the two heads of the femoro-tibialis 

 muscle, is inserted on the whole outer surface of 

 the middle third of the femur. 



Caudi-femoralis (Plate III., Figs. I and 2, cd. 

 fm., Plate IV., Fig. I, cd. fm.) (Pyriformis, Pyrifor- 

 mis-J-Subcaudalis, Femoro-peroneo-coccygeus, Ex- 

 tensor femoris caudalis). This muscle in the 

 Crocodilia consists of two parts: 



I. The chief part extends from the first post- 

 sacral (the twelfth) vertebra caudad ; it springs from 

 the roots of the caudal ribs (transverse processes) 

 and the whole lateral surface of the vertebral 

 arches. Since the first postsacral vertebra has no 

 ventral process, the muscles of the opposite sides 

 fuse in the mid-line. Towards the caudal region 

 it gradually increases in strength. Its fibers con- 

 verge in a latero ventral direction to form a short, 

 thick tendon which attaches itself to the inner 

 surface of the femur mediad and somewhat below 

 the trochanter. At right angles from this tendon 

 extends a round, long tendon which, lying parallel 

 to the hinder side of the thigh, pushes in between 

 the chief parts of the ischiadicus and later between 

 the origin-tendon of the gastrocnemius and pero- 

 neus posterior muscles, and is inserted on the poste- 

 rior surface of the head of the fibula. 



