Newbian. — Notes on the Physioloijy and Anatomy of the Tuatarcl. 235 



Muscles of Jdnd linibs. 



Musculus agitator candfe, also called ileoperoneal, very long and thin, 

 arises from the sacrum, passing behind the posterior border of the ilium runs 

 down the outer and posterior aspect of the leg, and is inserted by a tendinous 

 expansion into the outer and upper part of the fibula. In its course 

 it covers in the great ischiatic nerve from its escape behind the ilium till it 

 pierces the gastrocnemius and soleus. It draws the hmb backwards. 



Extensor quadriceps cruris should be called triceps not quadriceps, for it 

 arises by three heads. The long head arises from the whole of the outer 

 surface of the ilium, occupying the space which in men is occupied by the 

 glutei ; it grows bulky and passes down the outside of the thigh to join the 

 other heads. The short head arises from the whole of the outside of the 

 femur just below the insertion of the M. pectineus. The third head arises 

 from the ilio-pubic suture, and near the knee joins the other heads-, from 

 which it is at first widely separated. The musculus pectineus divides the 

 last two heads. The slender head arises close to the origins of the gracilis 

 and sartorius. The three heads converge to be inserted by a very broad 

 and strong fascia and ligament into the upper surface of the tibia. The 

 ilio-pubic head draws the limb forward. 



There is a muscle which Gilnther calls pectineus, but which Mivart 

 and Sanders, in Menojyoma, call psoas and iliacus. I think it should be 

 called iliacus. Giinther calls a wholly different muscle iliacus internus. 

 I know not why, for it is an external muscle, corresponding in size to 

 gluteus medius. A muscle arises from the inner surface of the cartilaginous 

 edge of the uncinate process of the pubis, and passes on over the edge of 

 the ilium, to be mserted into the fascia lata, in the same manner as the 

 tensor vaginte femoris. Below this small muscle is the one which Giinther 

 calls pectineus ; it is large and springs from the whole of the ventral surface 

 of the pubis and ilium, crosses the ilio-pubic crest, lies close to the aceta- 

 bulum, and is inserted by a broad tendon into the middle-third of the outer 

 surface of the femur. It also arises from the ilio-]3ubic ridge. It draws 

 the leg forward and rotates it outwards : it is very powerful. This muscle 

 and the preceding one are separated from the bladder and cloaca by peri- 

 toneum. In some lizards this muscle arises by four heads. In Platydactylus 

 japonicus Sanders found the muscle which I have called tensor vaginse 

 femoris. 



Musculus gracilis arises from the uncinate process of the pubis, anterior 

 to origin of the long head of extensor cruris, runs down the inside of thigh 

 alongside the head of the biceps, and is inserted into posterior and upper 

 part of the tibia. It antagonizes the biceps. 



A broad thick sheet of muscle arises from the symphysis ossium pubis et 



