1870.) MYOLOGY OF CHAMALEON PARSONII. 881 
not take origin either from the femur, as in the Iguana*, or from 
the interarticular cartilage, but from the posterior aspect of the tibia, 
partly within the internal lateral ligament. Passing downward 
obliquely to the peroneal side of the foot, it is inserted (close to and 
superficial to the insertion of the biceps) into the peroneal side of 
the plantar ossicle. 
At its origin this muscle has the insertion of the gracilis on its 
inner side, that of the semitendinosus on its peroneal side. 

_ Deeper muscles of back of right leg. 
B. Biceps. F.D'. Flexor longus digitorum. /. D?. Flexor tertius digitorum. 
G. Gracilis. G.E. Gastrocnemius externus. G.J. Gastrocnemius inter- 
nus. J.P. Ilio-peroneal. P. Peroneus. SS. Tibial adductor. S. M. Se- 
mimembranosus. S&S. 7. Semitendinosus. 7. A. Tibialis anticus. 7. P. 
Tibialis posticus. y. Tendon of femoro-caudal. 
Flexor longus digitorum (figs. 17, 18, 19, 23, 24, & 29, F. D’). 
Just reversing the condition of the gastrocnemius externus, this 
muscle is very broad above, but becomes tendinous below. It arises, 
by muscular fibres, from the femur, above the peroneal condyle (just 
above the femoral origin of the flexor tertius), also from the fascia 
behind the peroneal part of the interarticular cartilage, and, thirdly, 
from the hinder side of the fibula, below its summit. Passing down- 
ward it suddenly contracts to a delicate tendon placed between the 
tendons of the flexor hallucis and flexor tertius. It is inserted into 
the third and fourth, its tendon bifureating. The branch to the 
fourth digit receives a slip from that tendon of the flexor tertius 
which goes to the fifth digit. The branch to the fourth digit 
receives two slips, one from the flexor tertius, the other from the 
flexor longus hallucis. 
Flexor longus hallucis (figs. 20, 26, & 29, F. H). This muscle is 
placed very deeply (between the tibialis posticus and the popliteus), 
* P.Z.8. 1867, p. 795. 
