The Muscles 121 
Glutzus 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. 1 and 2, cd. 
fm., Plate IV., Fig. 1, cd. fm.) (Pyriformis, Pyrifor- 
mis+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 lateroventral 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, 
