1870. ] MYOLOGY OF CHAMZLEON PARSONII. 877 
Femoro-caudal (figs. 17, 24, & 27, F.C & y). This is large 
and fleshy, and arises beneath the transverse processes of the four 
caudal vertebree behind the sacral vertebree. The anterior and 
smaller part of this muscle is somewhat separate, and folded over 
the hinder and larger part. The muscle is in part inserted into the 
Fig. 20. 

m\ 
Deep muscles of back of right leg. 
£. B, Extensor phalangorum. F. D?. Flexor tertius digitorum. FH. Flexor 
hallucis. G. Gracilis. G.Z. Gastrocnemius internus. J. P. Tlio-peroneal. 
P. Peroneus. PP. Popliteus. P. 7. Peroneo-tibial. TP. Tibialis pos- 
ticus. 
posterior aspect of the great trochanter; in part it ends in a very 
delicate tendon (y), which runs along the outer edge of the semi- 
membranosus, the great sciatic nerve crossing it superficially on its 
outer side. The tendon dips down beneath the head of the flexor 
tertius digitorum on one side, and the tendon of the gastrocnemius 
externus and the head of the flexor longus digitorum on the other. 
It is inserted into the posterior aspect of the interarticular cartilage, 
which is placed between the femur and the tibia. 
Three muscles, which I cannot at present accurately determine, 
but which I provisionally designate as gluteus primus, gluteus 
secundus, and gluteus tertius, pass from the ilium to the outside of 
the femur. 
Gluteus primus (figs. 4,17, & 21, D'). This seems to answer to 
the muscle I have called gluteus medius in the Iguana*. It arises 
between two heads of the rectus femoris, from the lower part of the 
outer side of the ilium. Passing downwards, just in front of the 
gluteus tertius, and beneath the third part of the rectus femoris, it 
is inserted into the middle of the outer side of the shaft of the femur, 
between the forked origin of the vastus externus. 
The gluteus secundus (figs. 17, 22, & 27, D’) springs from the 
postero-external surface of the ilium, having the femoro-caudal con- 
* P. ZS. 1867, p. 791. 
